Azure Arc Server May 2026 Forum
Please find the recording for the monthly Azure Arc Server Forum on YouTube! During the May 2026 Azure Arc Server Forum, we discussed: Private Preview of Windows Server 2016 Extended Security Updates (ESUs): Customers with Windows Server 2016 Servers with an NDA and willingness to provide feedback can sign up at https://aka.ms/WS2016ESU-PrivatePreview Special Announcement: Windows Server Hotpatch enabled by Azure Arc is now available at no additional cost for Windows Server 2025 machines connected to Azure Arc Feedback opportunity to product group on Azure Arc + RDP Capability: Customers can sign up at https://aka.ms/arc-rdp To sign up for the Azure Arc Server Forum and newsletter, please register with contact details at https://aka.ms/arcserverforumsignup/. For the latest agent release notes, check out What's new with Azure Connected Machine agent - Azure Arc | Microsoft Learn. Our June 2026 forum will be held on Thursday, June 18 at 9:30 AM PST / 12:30 PM EST. We look forward to you joining us, thank you!Ansible + Azure Arc: Use Ansible modules to deploy and manage Azure Arc machine extensions at scale
We are making Azure Arc extensible and increasing the flexibility of the tooling you can use to operate your machines using Azure’s control plane. We are excited to announce new modules in Ansible Galaxy that make it easier to manage Azure Arc machine extensions at scale. With the latest updates to the azure.azcollection on Ansible Galaxy, you no longer need to switch between existing tools. You can now deploy and manage Azure Arc extensions using familiar, declarative Ansible workflows. These new modules include: Azure Arc machine extensions module Azure Arc extensions info module Together, they enable infrastructure and platform teams to automate extension lifecycle management across their hybrid estate—bringing consistency, security, and efficiency to Azure Arc-enabled servers. Why this matters Azure Arc machine extensions power critical scenarios such as security, monitoring, update management, configuration and compliance. Until now, managing these Azure Arc extensions across hybrid estates often required Azure CLI scripts, ARM templates, or manual operations. With these new Ansible modules, you can: Integrate Azure Arc extension management into existing Ansible playbooks Enforce consistent configuration across hybrid servers Reduce operational overhead through declarative automation Align extension deployment with broader configuration management workflows What’s included azure_rm_arcmachineextensions This module allows you to manage the full lifecycle of Azure Arc machine extensions, including: Creating and deploying extensions Updating extension settings Removing extensions when no longer needed You can define extension state declaratively, ensuring consistent enforcement across your Azure Arc-enabled servers. azure_rm_arcmachineextensions_info This module provides visibility into extension state by retrieving: Installed extensions on Azure Arc-enabled machines Provisioning status and configuration details Extension metadata for reporting and validation This is useful for compliance validation, auditing, and conditional automation in playbooks. Scenario: Enforcing identity-based SSH access across a hybrid fleet Consider a regulated enterprise that must ensure all Linux servers—whether on-premises or in a multicloud environment—use Microsoft Entra ID for SSH access. The organization wants to: Eliminate local SSH credentials Enforce centralized identity and access controls Audit access consistently across all environments By combining Azure Arc with Ansible, the organization can deploy the Microsoft Entra SSH for Linux extension across all Azure Arc-enabled servers as part of a standardized playbook, ensuring compliance and reducing operational overhead. Example: Deploy Microsoft Entra SSH for Linux extension Below is an example of using Ansible to deploy the Microsoft Entra SSH extension to an Azure Arc-enabled server: - name: Deploy Entra SSH extension to Arc server hosts: localhost connection: local tasks: - name: Install Entra SSH extension for Linux azure_rm_arcmachineextensions: resource_group: myResourceGroup machine_name: myArcServer name: AADSSHLoginForLinux publisher: Microsoft.Azure.ActiveDirectory type: AADSSHLoginForLinux type_handler_version: "1.0" settings: {} state: present Example: Retrieve extension information Below is an example of using Ansible to retrieve details about your Azure Arc extensions: - name: Get Arc machine extension details hosts: localhost connection: local tasks: - name: Fetch extensions azure_rm_arcmachineextensions_info: resource_group: myResourceGroup machine_name: myArcServer Integrating with existing Ansible workflows If you’re already using Ansible for: OS configuration Patch and update management Application deployment You can now extend those workflows to include Azure Arc extension management—without introducing new tools or processes. This allows you to manage on-premises servers, Edge infrastructure and multicloud environments through a unified automation approach powered by Azure Arc and Ansible. Read more at Enable VM Extensions Using Red Hat Ansible - Azure Arc | Microsoft Learn What’s next These modules are part of our continued investment in making Azure Arc a first-class platform for managing Windows and Linux machines in hybrid and multicloud infrastructure. By bringing extension lifecycle management into Ansible, we’re enabling teams to enforce security, compliance, and operational consistency at scale—using the tools they already trust. Stay connected Join the Azure Arc Monthly Forum here: aka.ms/ArcServerForumSignup Let us know what you’d like to see next in the comments!Build, deploy, and govern sovereign AI with Foundry Local on Azure Local
Not every AI workload can run in the cloud. For many of our customers, data needs to stay within defined boundaries, connectivity may be limited or absent, and latency, governance, and auditability are non-negotiable. With Foundry Local on Azure Local, you can use the same model catalog, developer workflows, and governance capabilities you know from Azure, while running AI entirely within your own environment where your data resides. Foundry Local provides the model catalog and developer experience. Azure Local provides the customer-managed infrastructure. Azure Arc provides unified policy, governance, and lifecycle management across cloud and local environments. This gives developers a consistent way to build, deploy, and operate AI. The same az commands, the same model catalog, the same Arc policies, all running on hardware you control. Expansion of Foundry Local on Azure Local We're expanding the Foundry Local model offering on Azure Local, with support for multi-node deployments and new agents and tools that run locally, in preview. Deploy and run AI models locally. Run models with Foundry Local in customer-managed environments on Azure Local, across sovereign, private, and edge scenarios, including fully disconnected operation. Choose from a flexible, high-performance model catalog. Access proprietary and community models through Foundry Local, now expanded with vLLM-optimized models alongside ONNX-based offerings. You explore and deploy through the same catalog API experience, then operate locally on Azure Local. Build for production realities. Bring governance, identity, and auditability into your applications while keeping execution inside your controlled boundary. See what’s new in Foundry Local on Azure Local in the Tech Community blog. From intelligence to action: agents and tools inside the enterprise boundary Most production AI use cases need two things: grounded answers and the ability to act on them, without sending data outside the environment. Here's how we're enabling that locally. Preview: Agentic retrieval with Foundry Local: Ground agents in enterprise data using retrieval-augmented generation across local Microsoft 365 services, including Exchange and SharePoint. Read the Tech Community blog to learn more. Preview: Agents and tools with Foundry Local: Build AI systems that reason, retrieve information, and take action within customer-controlled environments. Learn more. Preview: Developer acceleration templates: Jump-start local AI application development with new Foundry solution templates, including local chat experiences and video agents, powered by Azure AI Video Indexer. Read the Tech Community to learn more. GitHub Enterprise Local: Now available in public preview Sovereign AI is also about how systems are built and secured, not just where they run. With GitHub Enterprise Local on Azure Local, you can bring your full software development lifecycle on-premises: Source control and repositories CI/CD pipelines Security and DevSecOps workflows GitHub Enterprise Local deploys entirely within customer-owned infrastructure, so teams get the developer tools they expect without compromising on data residency or operational control. This extends modern DevSecOps practice into sovereign environments and pairs naturally with the AI development workflows above: build, secure, and ship your AI applications within the same boundary where they run. Read the tech community blog to learn more about GitHub Enterprise Local and how to join the preview. Accelerating High-performance AI at the Edge with NVIDIA We are expanding our collaboration with NVIDIA to deliver high-performance AI capabilities directly at the edge. At Build, we are bringing: Azure Local and Foundry Local on NVIDIA-powered GPUs, including NVIDIA RTX PRO 6000 Blackwell Server Edition, with expanded GPU support coming soon Integration with Nemotron models, optimized for enterprise performance A scalable foundation for data-intensive, low-latency workloads This partnership ensures that organizations can run advanced AI workloads where data is generated - without dependency on centralized cloud infrastructure. Hardware options: AI factory configurations are available now in the catalog Alongside our hardware partners, we’re bringing integrated solutions to customers building AI within sovereign environments. The Azure Local hardware catalog now includes AI factory configurations from our OEM partners, including NVIDIA-certified 8xH100 systems, with options from DataON, Dell, HPE, and Lenovo. These configurations are sized for the performance that model serving and agentic workloads require on customer-managed infrastructure. Together with Microsoft, we are advancing sovereign AI by bringing the open NVIDIA Nemotron model family to Microsoft Foundry Local on Azure Local. This collaboration gives organizations a production-ready AI platform that enables them to deploy AI where their data resides while maintaining the governance, control, and performance needed to scale AI across the enterprise.” Kari Briski, VP Generative AI Software Products, NVIDIA ”Sovereign AI is becoming increasingly important for governments, regulated industries, and enterprises that want to use AI while maintaining control of their data, location, and operations. Lenovo’s ThinkAgile MX Series delivers trusted, enterprise-grade infrastructure with global deployment expertise to help customers run AI wherever their data resides. Co-engineered with Foundry Local and Azure Local, this solution provides an optimized platform to deploy, run, and scale AI locally with greater simplicity, consistency, and control, while helping meet strict data residency, security, and compliance requirements." Scott Patti - VP Infrastructure Solutions Group (ISG), Lenovo From AI models to trusted, mission-critical systems: what this unlocks for developers and operators AI is evolving from systems that answer questions to systems that plan, reason, and take action across workloads. These capabilities move AI from a cloud-only assumption to something you can deploy where sensitive work actually happens, with governance and operational controls intact. For our customers, this means you can now: Keep data, identities, and audit trails inside your sovereign boundary. Run AI inference and agentic workloads in connected, intermittently connected, or fully disconnected modes. Apply consistent policy and governance across cloud and local environments through Azure Arc. Use the same Foundry catalog and developer experience you already know, on infrastructure you own. Build, secure, and ship your AI applications with GitHub Enterprise Local, keeping source control, CI/CD, and DevSecOps workflows inside the same sovereign boundary. Resources Join us at Build OD837 Shipping physical AI to the edge with Azure Local and Foundry Local https://github.com/microsoft/build26-OD837 OD839 Foundry Local: AI solutions for industrial and sovereign needs https://github.com/microsoft/build26-OD839 LTG425 Expanding horizons: Foundry Local for devices and on-prem https://build.microsoft.com/en-US/sessions/LTG425 Request to join the Foundry Local on Azure Local preview Hands-on walkthrough: Your first model deployment on Foundry Local on Azure Local: from catalog to inference in 10 minutes | Microsoft Community Hub Read our Tech Community blogs: Foundry Local announcing multi-node and vLLM support Agentic Retrival with Foundry Local blog: https://aka.ms/AgentsAndToolsBuildBlog2026 Code sample / model catalog blog: https://aka.ms/foundry-local-model-catalog-blog For more details on the expanded capabilities of Foundry Local for highly secure environments, contact your Microsoft account team Discover Microsoft Sovereign Cloud Explore product documentation at: Foundry Local models on Azure Local: https://aka.ms/FoundryLocalonAzureLocal_documentation Local Agentic retrieval with Foundry Local: https://aka.ms/edge-agentic-retrieval-docs
Simplified access to Hotpatching enabled by Azure Arc for Windows Server 2025
With Windows Server 2025, we introduced hotpatch enabled by Azure Arc, delivering security updates to Windows Server across hybrid and multicloud environments – minimizing downtime (no reboot), accelerating protection, and unifying patch management. We know that keeping your servers updated with the latest patches is one of the critical tasks that IT teams perform day-to-day. We want to make it simpler to install the latest operating system (OS) updates without rebooting machines after every installation. The resounding feedback we have received from you underscored the criticality of this feature in the lifecycle management and security of your infrastructure. We are now taking it one step further to reduce the friction to deploying these critical updates: hotpatch enabled by Azure Arc is now available at no additional cost for Windows Server 2025. Which machines are eligible for this offer? To use hotpatch for Windows Servers running on-premises or in multicloud environments, you must be using Windows Server 2025 Standard or Datacenter, and your server must be connected to Azure Arc. With this announcement, enabling and usage of the hotpatching service is available at no additional charge. Please take note that there are no charges for customers running on Azure IaaS, or Azure Local, wherein hotpatching is available as part of the functionality of Windows Server Datacenter: Azure Edition. This feature is already included both with Windows Server 2022 Datacenter: Azure Edition and Windows Server 2025 Datacenter: Azure Edition. How do I manage hotpatches enabled by Azure Arc for Windows Server 2025? If your Windows Server 2025 machines aren't already connected to Azure Arc, install the Azure Connected Machine agent — it takes just a few minutes per server and supports at-scale rollout via Group Policy, service principal, or Terraform. Once connected, enable Hotpatch from the Azure portal, Azure PowerShell, Azure CLI, or the REST API — just confirm Virtualization-based security (VBS is enabled) first. From there, use Azure Update Manager to schedule and monitor rollouts at scale. For instructions on how to enable hotpatch for Azure Arc-enabled machines using group policy or scripts, learn more here: https://aka.ms/ws-hotpatch For patch orchestration at scale, you can use Azure Update Manager to deliver hotpatches enabled by Azure Arc for Windows server 2025 machines. This enables greater uptime with fewer reboots and faster deployment of updates with easy patch orchestration. Alternatively, you can use APIs or other management tools to manage hotpatches. Centralized management of hotpatch updates across hybrid and multicloud environments enabled by Azure Arc Once your machines are connected to Azure Arc, you can also use the cloud-native services from Azure to manage your windows machines running on-prem. Azure Arc enables you to standardize security and governance across a wide range of resources so you can easily organize, govern and secure Windows, Linux, SQL servers, and Kubernetes clusters running across data centers, edge, and multi-cloud environments – using Azure services such as Azure Policy, Azure Monitor, Microsoft Defender and more. At no additional cost for machines attached to Azure Arc Basic inventory across on-prem and multi-cloud Tag your resources, organize them into resource groups, subscriptions, and management groups, and query at scale with Azure Resource Graph to unify your environments. Infra as Code (Bicep, Terraform) Infra as code for provisioning and management of resources. VM Self Service Perform lifecycle management such as (create, resize, update and delete) and power cycle operations such as (start, stop, and restart on VMware vCenter and System Center Virtual Machine Manager Virtual Machines. Hotpatch for Windows Server 2025 NEW Windows Server hot patching enables you to apply security updates without rebooting, keeping systems secure while maintaining continuous uptime. VM Management Administrate your servers anywhere using SSH for Azure Arc, Run Command, and Custom Script Extension. Mgmt. Services included for no additional costs with Windows Server Software Assurance or Extended Security Updates Azure Update Manager Provides a unified, centralized service to monitor, orchestrate, and automate patching across Azure, on‑prem, and multi‑cloud environments ensuring security, compliance, and minimal downtime at scale. Azure Machine Configuration (Policy) Policy‑driven auditing and enforcement of OS and application settings as code across Azure and hybrid machines—ensuring consistent, compliant state at scale. Including compliance policies like CIS Benchmark and WinRE Change Tracking & Inventory Real‑time visibility into configuration changes and system state across your fleet enabling faster troubleshooting, improved security, and continuous compliance at scale. VM insights from Azure Monitor Delivers a unified, pre‑built observability experience that provides real‑time performance, health, and dependency visibility across VMs—enabling faster troubleshooting, optimization, and capacity planning at scale. Windows Admin Center Unified, browser‑based management plane to securely manage Windows servers, VMs, and hybrid infrastructure from anywhere—simplifying operations and improving efficiency at scale. Best Practices Assessment Continuously evaluation your server configurations against Microsoft-recommended standards to proactively identify risks and provide actionable remediation guidance—improving security, performance, and operational health at scale. Frequently Asked Questions What are hotpatch updates? Hotpatch updates are monthly security updates that take effect without requiring you to restart the device. They contain a full set of security updates equivalent to the standard updates released the same day. What is the hotpatch update cycle? All eligible Windows Server 2025 machines enrolled in hotpatch are offered up to 8 monthly hotpatch updates in a calendar year in a quarterly cycle: Baseline month: In January, April, July, and October, devices install the monthly cumulative security update and must restart for the update to take effect. This update includes the latest security fixes, cumulative new features, and enhancements since the last baseline. Subsequent two months: Devices receive hotpatch updates, which only include security updates and don't require a restart for the update to take effect. These devices will catch up on features and enhancements with the next cumulative baseline month (quarterly). Will billing be stopped for existing enrolled machines? Yes, as of 15 th May 2026 all billing for hotpatch has been stopped for all existing machines enrolled in hotpatch. What action do we need to take if we have machines enrolled in hotpatch already? There is no additional action needed for machines that are currently enrolled in hotpatch. These machines will remain enrolled in hotpatch and receive hotpatch updates when available. I want all my Windows Server 2025 machines to get hotpatches. How do I do it? If you have Windows Server 2025 machines on-premises or on cloud (other than Azure) then you can enable hotpatch on them. To do so, ensure these machines have Virtualization Based Security enabled and are connected to Azure Arc and then you can use Azure Arc portal, Azure Update manager or APIs to enable hotpatch. Learn more: https://aka.ms/ws-hotpatch Is anything changing for Hotpatching on Azure? Hotpatch continues to be available on Azure for your Windows Server 2022 and Windows Server 2025 VMs when using Azure Edition. There is no fee associated with Hotpatching on Azure. Learn more here. Is there a community forum for Arc? Yes, you can join the Azure Arc Monthly Forum here: aka.ms/ArcServerForumSignup
Migration from Hosted Exchange (Hybrid) to M365 Classic Outlook Client Problems and Solutions
Hello Everyone, I'm a tech who started on a 8088 processor in the 80's. Not mentioning the Vic20 and C64 since that hardly seem relevant! I'm posting here to hopefully help the next person with the issues I've had over the last few weeks. My client had to port his email from a provider with an on-perm Exchange server in a Hybrid setup with M365 to his own M365 environment. I expected this was to be about 3 hours of work for me - setup M365 environment, plan the cut-over window, update the Outlook clients on each PC. It ended up being roughly 20 hours of my time and at least 10 hours of dedicated time for my client. For those wanting to jump directly to what mostly fixed it use this link, it should get you past the dreaded "an encrypted connection to your mail server is not available" when trying to add the mail account into a clean profile. Use https://support.microsoft.com/en-us/windows/classic-outlook-troubleshooters-086e3d66-5404-4034-9cc5-545909dcc166 and pick "Classic Outlook Profile Setup Troubleshooter" Most hits are going to tell you its an autodiscovery issue, but if you're reading this I'm going to assume you've already confirmed that. Our issue was some ghost configuration, only on the PCs previously setup for mail on the old server. A new PC could add the same account without issue. Some of the research suggested this would not happen if the proper Microsoft migration process is followed to move the account - but in our case the previous provider was unable to perform the migration. I'll skip over the research we tried along the way, such as New Outlook Profiles, Registry entry changes, MS Personal users with the same email as MS Business Users, Autodiscover problems (including concerns that the base website for the client was offering invalid data), and so on. After each hit where we applied a fix we again had to try adding the mail to the profile, and each time we sat watching the little circle for up to 5 minutes only to get the same error. Now, once we found the link above - which did not come up in most searches - things got better, but not 100%. We added the profile ok but then Outlook gave a permission error while starting. To fix that, the user signed in must have administrative access and you use File Explorer to navigate to the folder identified in the error. In our case it was in folders kept under \Windows\System32\. When prompted that we need to grant permanent access we said yes. In our case this is where Outlook was storing the ost files. That worked for most of the clients, but we had one additional issue where the error was pointing to a folder that didn't exist. Just creating the folder was not enough, the final fix was to hold CTRL-SHIFT down while opening Outlook to start in administrative mode to allow it to create the ost file in the newly created folder. Finally 3 weeks after our cut over window, while the client had to use OWA, we were able to get outlook running. This was critical for my client because they did not have access to the mail history since the migration didn't happen - they had to open a copy of their PST in Outlook and use mail in OWA and constantly bounce back and forth. I hope this helps someone avoid the pain we went though!HVE for Microsoft 365: When to Use It, When Not To, and Who Should Be Allowed to Send at Scale
Microsoft recently announced the General Availability of High Volume Email for Microsoft 365, also known as HVE, in Exchange Online. This is an important and long-awaited capability for organizations that need to send large volumes of internal email from applications, devices, or line-of-business systems without using regular user mailboxes as bulk-sending engines. But HVE should not be misunderstood. It does not mean that every mailbox in Exchange Online should now be used for mass email. It does not mean Exchange Online has become a general-purpose marketing platform. And it does not remove the need for proper outbound email governance. Why HVE Matters For years, many organizations have used regular Exchange Online mailboxes, shared mailboxes, or service accounts to send automated messages from applications, scanners, monitoring platforms, ticketing platforms, and custom business applications. That approach creates several problems. Standard mailboxes are designed for human and business communication, not for sustained high-volume automated traffic. Exchange Online has recipient limits, message rate limits, outbound spam protections, and tenant-level controls to protect the service and reduce abuse. HVE introduces a more appropriate model for specific high-volume scenarios. Instead of using a normal mailbox for automated traffic, organizations can create dedicated HVE accounts and use specific SMTP endpoints, admin controls, reporting, and governance for approved high-volume internal messaging scenarios. What HVE Is Designed For HVE is designed for automated, operational, and transactional messaging at scale, primarily for internal recipients within the tenant. Examples include: Internal application notifications. Line-of-business system messages. Device-generated messages. Operational alerts. Security advisories. Internal workflow communications. Monitoring platform alerts. IT service notifications. Large-scale internal announcements generated by systems. This is especially relevant when the organization needs to send messages at scale but still wants to keep the workload within Microsoft 365 governance and Exchange Online mail flow. In practical terms, HVE is useful when the sender is not a human user, but a controlled business system. What HVE Is Not HVE is not a replacement for marketing platforms. HVE is not a general-purpose internet bulk email engine. HVE is not a way to bypass Exchange Online sending limits for external campaigns. HVE is not the correct platform for newsletters, promotional campaigns, large-scale customer communication, or high-volume external transactional email. For external transactional, marketing, or customer-facing bulk email, organizations should evaluate platforms designed for that purpose, such as Azure Communication Services Email, SendGrid, Amazon SES, Mailchimp, Brevo, or another specialized delivery platform. When to Use HVE Use HVE when the workload matches these characteristics: The sender is an application, device, service, or business system. The recipients are primarily internal users in the Microsoft 365 tenant. The volume is higher than what should be sent from a standard mailbox. The workload is operational, automated, or transactional. The organization needs centralized Microsoft 365 administration and reporting. The organization wants to avoid impacting user mailbox sending limits. The use case is approved, documented, monitored, and governed. Good examples: A security platform sending internal security advisories. A monitoring system sending infrastructure alerts to internal teams. A business workflow system sending high-volume approval or status notifications. An IT service platform sending internal notifications. A service management platform sending ticket updates to internal users. A device management system sending operational messages to internal teams. When Not to Use HVE Do not use HVE when the workload is external bulk email. Avoid HVE for: Marketing campaigns. Newsletters to customers. Promotional email. Mass external invitations. External transactional email at scale. Customer invoices and receipts in high volume. OTP or password reset flows for external users. External portal notifications. Any workload where deliverability, bounce handling, reputation management, unsubscribe handling, analytics, or customer consent management are required. Those workloads require a platform designed for external delivery, reputation management, suppression lists, opt-out, tracking, bounce handling, and compliance. Who Should Be Allowed to Use HVE HVE should not be enabled casually for every team or every application. It should be treated as a controlled platform capability. Recommended eligible senders: Approved line-of-business applications. Corporate systems owned by IT, Security, Operations, Facilities, or Service Management teams. Managed devices or services with a clear business purpose. Internal platforms that send operational messages to employees. Applications with documented ownership, authentication, monitoring, and expected volume. Recommended non-eligible senders: Normal users. Shared mailboxes used by humans. Marketing teams sending to external audiences. Unmanaged scripts. Legacy systems with no owner. Applications with unknown volume. Systems that send to external recipients at scale. Any application using HVE just to avoid standard mailbox limits. The core principle is simple: HVE should be enabled for workloads, not for convenience. Governance Model Before enabling HVE, organizations should define a governance model. At minimum, each HVE account should have: A named business owner. A technical owner. A documented purpose. Expected daily and monthly volume. Recipient scope. Authentication method. Monitoring process. Incident response path. Decommissioning criteria. Review frequency. HVE accounts should not become invisible service accounts that nobody owns. They should be treated as privileged communication identities. Security and Authentication HVE supports OAuth authentication, and Microsoft provides guidance for restricting OAuth authentication to specific Microsoft Entra ID applications. This is important because organizations should avoid broad, uncontrolled access. They should restrict which applications can send through each HVE account, monitor usage, and separate workloads by purpose. For example: One HVE account for security alerts. One HVE account for monitoring systems. One HVE account for IT service notifications. One HVE account for internal operational communications. This separation improves visibility, investigation, accountability, and risk containment. HVE vs Standard Exchange Online Mailboxes A standard Exchange Online mailbox should be used for normal human communication. A shared mailbox should be used for collaborative business processes. An HVE account should be used for approved high-volume internal system email. A dedicated external delivery platform should be used for marketing, bulk external communication, or high-volume transactional email. Scenario Recommended Platform Human business email Exchange Online mailbox Team or department mailbox Shared mailbox Low-volume application notifications Standard Exchange Online, if approved High-volume internal system notifications HVE Internal operational alerts at scale HVE Marketing campaigns Marketing platform External transactional email Transactional email service Customer newsletters Marketing automation platform OTP/password reset for external users Dedicated transactional platform External bulk email Dedicated bulk email provider HVE and the Mailbox External Recipient Rate Limit Cancellation Microsoft also announced that the Mailbox External Recipient Rate Limit in Exchange Online was cancelled indefinitely. However, that cancellation should not be interpreted as permission to use Exchange Online for uncontrolled bulk sending. Microsoft was clear that other limits remain unchanged, including the existing Recipient Rate Limit and the Tenant-level External Recipient Rate Limit. That distinction is important. The cancellation of one mailbox-level external recipient limit does not remove the need for proper architecture. Exchange Online still has service limits. Outbound spam controls still apply. Tenant-level protections still matter. And HVE is still not a marketing engine. Practical Architecture Decision Before enabling HVE, ask these questions: Who is sending? Is the sender a human, shared mailbox, application, or device? Who are the recipients? Are they internal or external? What is the expected volume? Is the workload operational, transactional, promotional, or human communication? Does the business need Microsoft 365 mail flow and governance? Does the use case require bounce handling, unsubscribe, tracking, or reputation management? Is the application properly authenticated and monitored? Who owns the account? Who approves the sending pattern? Who responds if the account is abused? If the workload is internal, automated, high-volume, and business-approved, HVE may be the right answer. If the workload is external, promotional, customer-facing, or marketing-driven, use a dedicated email delivery platform. Recommended Enablement Approach Organizations should enable HVE in phases. First, identify existing systems currently using user mailboxes, shared mailboxes, or SMTP AUTH for automated sending. Second, classify each workload as internal, external, operational, transactional, marketing, or human communication. Third, migrate only approved internal high-volume workloads to HVE. Fourth, move external high-volume workloads to dedicated email delivery platforms. Fifth, monitor usage and review HVE accounts regularly. This avoids turning HVE into another uncontrolled sending layer. Conclusion High Volume Email for Microsoft 365 is an important addition to Exchange Online. It gives organizations a native way to support high-volume internal system messaging without using standard mailboxes for automated high-volume traffic. But HVE is not a free pass for bulk email. It is not a marketing platform. It is not a replacement for transactional email services. And it should not be enabled for every mailbox or every application. The right approach is workload classification. Use Exchange Online for corporate communication. Use HVE for approved high-volume internal system messaging. Use dedicated platforms for external bulk, marketing, and transactional email. The question is not only: “Can this system send email through Microsoft 365?” The better architectural question is: “What type of email is this, who is the audience, and what is the correct platform for this workload?” That is where proper email architecture begins.
