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Migration of existing DLs and DDLs to M365 Groups
Hello Everyone, We are currently having all our DLs and DDLs in Exchange Online, all users in our org have E5 license. We are planning to move all DLs and DDLs to M365 groups to change for better approach for communication. Can someone help me where I can find the step by step guidance for it? My main task is to identify what can broken by doing this migration?Tenant-to-Tenant Migration with Orchestrator – Technical Overview (Microsoft 365 | Preview)
Tenant-to-tenant migration with Orchestrator in Microsoft 365 introduces a native, API-driven, and highly validated approach for cross-tenant migrations. It is designed for enterprise scenarios where sequencing, dependencies, and governance are critical. Note: This capability is currently in preview. Features and behavior may change before GA. Architecture and execution model Migration is executed through batches (jobs) managed via Microsoft Graph (Beta) User-level execution: one user failing validation does not block others in the same batch Mandatory Standalone Validation before migration submission Date-driven cutover using completeAfterDateTime Supported workloads (actual scope) Exchange Online Microsoft Teams ODSP (OneDrive for Business) Important clarification on SharePoint Orchestrator does not migrate shared SharePoint content such as Team sites, Channel sites, or collaboration sites. The ODSP workload covers personal user data (OneDrive) only. SharePoint team/workload sites remain out of scope and require separate tooling or processes. Critical prerequisites Identity Mapping (CTIM) is mandatory and must remain stable during migration Target users must not have Exchange mailboxes or OneDrive sites provisioned before migration Licenses must be assigned only after Identity Mapping (ExchangeGuid stamping) Migration apps and service principals (Teams, Meetings, CTMS) must be correctly provisioned Organization Relationships and Migration Endpoints must be in place Exchange autoforwarding must be enabled for Meetings migration Validation and lifecycle Standalone Validation acts as a full “what-if” check Key states include: Cancellation or user removal is possible only before cutover Post-migration cleanup After completion, tenants must be returned to a non-migration state: Remove Identity Mapping data Remove Organization Relationships Remove Migration Endpoints Revoke migration app permissions and service principals Decide whether to retain or remove MailUsers in the source tenant Skipping cleanup leaves the tenant in an exception state. When this approach fits Mergers and acquisitions Divestitures and tenant splits Regulated environments requiring strict control Scenarios where dependency-aware sequencing matters more than speed Technical conclusion Orchestrator is not a one-click solution. It delivers native orchestration, deep validation, and predictable execution when Identity Mapping, licensing order, and scope boundaries are fully understood. For experienced administrators and architects, it represents a major step forward in tenant-to-tenant migrations within Microsoft 365, even while still in preview.New Group Members not seeing Appointments
We are trying to determine why members that recently have joined a group do not see meetings that were scheduled before they joined, but are set for future dates. The one particular instance I'm chasing is a recurring meeting that was created before I joined the group. The person who created the invite has also updated the meeting details, should this not kick off some trigger to new groupies? Office 365 support has indicated that this is expected behavior. Would like to get a firm answer.
Unable to change primary SMTP of a group
I have a 365 group linked to Teams, with the primary SMTP address of mailto:HumanResources@(domain) I have been trying to change that by promoting an alias (PTmailto:onTeams@(domain)) to be the new primary. Every time I do this, it reverts to the original HumanResources address. A bit of searching suggested I try checking the primary address with the Get-UnifiedGroup powershell command, then setting it with Set-UnifiedGroup. Unfortunately, Get-UnifiedGroup shows that the primary SMTP is the desired PTonTeams address. It just isn't showing as such on the Exchange admin page. If I look up that same group in Azure, it also shows that it has the original address set as Primary SMTP. Can anyone shed some light on what might be going on and help me change this email address? Thank you!
Help Shape the Future of Groups and Copilot in M365
M365 Groups team is exploring two key areas to improve and simplify collaboration through Groups and Copilot. Your feedback will help us understand how you use Copilot with M365 Groups and Teams Channels today and identify opportunities to simplify and modernise group types. Copilot with Groups and Teams Channels Knowledge - We want to understand how you use Copilot today and how you leverage them for M365 Groups and Teams Channels Knowledge. Tell us your top scenarios, challenges, and what would make Copilot more valuable. Groups Usage and Simplification - Using and managing multiple groups types like M365 Groups, Security Groups, Mail Enabled Security Groups, Distribution Groups can be complex. We want to understand your current usage, pain points, and ideas for simplifying this. Please take a few minutes to share your insights through this survey - https://forms.office.com/r/CJLuuzEYQg
I upgraded a DL to a 365 Group. Can I create and link a SharePoint site?
As above, I upgraded one of our existing Distribution Lists to a Microsoft 365 group. Everything appears to have worked correctly, but there's no SharePoint site that would be created automatically when creating a group from scratch. Is there a way to create a new SharePoint site and link it to the existing group? I know I could make a classic site then link it to a New group, essentially I want to do that but link it to the newly created group.
