Migration from Exchange on prem to Exchange online
Will migration from on-premise Exchange to Exchange Online stop working as of October 2026? You can see this error in the logs:"Error: The job encountered too many transient failures (61) and is quitting. The most common failure is CommunicationErrorTransientException with the hit count 60." And in IIS you see error 401 The solution is to recreate the migration endpoint using the UPN (email address removed for privacy reasons) instead of "Domain\user". Simply modifying the existing endpoint will not work.Microsoft Defender for Office 365: New “Move to Quarantine” Feature Coming Soon
Microsoft introducing Move to Quarantine, a new remediation action in Microsoft Defender for Office 365. It enables security teams to move potentially malicious email messages from users' mailboxes directly to Microsoft Defender quarantine. This provides a safer and more flexible way to contain suspicious messages that bypassed initial detection while preserving the ability to investigate, release, or permanently delete them later. This capability is available with Microsoft Defender for Office 365 Plan 2, including eligible Microsoft 365 subscriptions that include Plan 2. Rollout schedule General Availability (Worldwide): Beginning in early November 2026 and expected to complete by mid-December 2026 Remediate malicious email that was delivered in Office 365 - Microsoft Defender for Office 365 | Microsoft Learn
Backdoor.MSIL.Webshell.gen
Hello ; My antivirus detected Trojan -------------------- Probably infected object detected: Trojan HEUR:Backdoor.MSIL.Webshell.gen. Object name: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\owa\8e05b027\e164d61b\App_Web_z1qruv0b.dll MD5 file hash: fd34b27c2ea1a4702e265f6d1f05fe16 File SHA256 hash: a4f7b4261a9f70bd5247f497ff384012a71d75010765cc7174724ed04ed9b047 ---------------------- and w3wp.exe I alreday upgraded that to CU22 before this atttack and also installed the last Security patch for CU22. I ran the MSERT tool and other Security Script for Exchange . But has been removed but the mystery of the re-infections continues . Could you help me
Access old Exchage after migration to 365
Hi all So I have migrated from Exchange OnPrem to Exchange Online. Before migration I have taken a snapshot from the Exchange server, just in case. Now, there is a user who claims that some of her contacts vanished during the migration. So I booted up the backup Exchange and tried logging into the OWA to see if I can find some cantacts there. However, when trying the OWA, using the localhost url I get redirected to the online Outlook. Obviously the Exchange server recognizes soemwhere in the AD that we have migrated. So my question: How do I access the old information on the OnPrem Exchange Server if I did not think of keeping a backup of the DC?Why do Apple macOS and Ubuntu clients display Exchange meeting times one hour earlier than scheduled
If a meeting is generated from Apple macOS and Ubuntu clients showing the meeting time as one hour earlier than the actual scheduled time email solution is exchange server 2019, what will be the issue.
Teams calendar for exchange on prem users not working
Hello I am having issues to make Exchange On prem users use Calendar on teams. Initially Client autodiscover was blocked externally but they added a cname and open flows but I am still having issues to makecalendar on teams work HCW as passed and new hybrid dedicated app was used any help is welcome
Cross-Tenant Mailbox Migration - HTTP 401 Unauthenticated during Test-MigrationServerAvailability
We are performing a Cross-Tenant Exchange Online mailbox migration between two Microsoft 365 tenants. The migration endpoint is configured with ApplicationId authentication and validates successfully. When running: Test-MigrationServerAvailability -Endpoint "MexicoToPortugal" -TestMailbox "<user>" the test consistently fails with: StatusCode="Unauthenticated" HTTP Status Code: 401 We reproduced the issue with two different users. We have already validated: - MailUser configuration - ExchangeGuid - LegacyExchangeDN (X500) - ExternalEmailAddress - Accepted Domains - Organization Relationships - Migration Endpoint - Enterprise Application - Mailbox.Migration permission - Admin Consent - Cross-Tenant Migration licensing The same HTTP 401 error occurs for multiple mailboxes after all configuration issues are corrected. Has anyone experienced a similar Cross-Tenant Mailbox Migration scenario where Test-MigrationServerAvailability returns HTTP 401 Unauthenticated even though the Enterprise Application, Mailbox.Migration permission and Admin Consent are correctly configured?Retirement of Azure Communication Services
Microsoft has announced several retirement and breaking changes in September 2026. One notable change is the retirement of Azure Communication Services as a standalone offering, scheduled to take effect on September 30, 2028. Organizations currently using Azure Communication Services should review the announcement, assess the potential impact on their environments, and begin planning accordingly. https://learn.microsoft.com/en-us/azure/communication-services/acs-retirement-and-breaking-changes-guide Which Microsoft service would be the best option for sending approximately 10,000 bulk emails per day?Retirement of Azure Communication Services
Microsoft has announced several retirement and breaking changes in September 2026. One notable change is the retirement of Azure Communication Services as a standalone offering, scheduled to take effect on September 30, 2028. Organizations currently using Azure Communication Services should review the announcement, assess the potential impact on their environments, and begin planning accordingly. https://learn.microsoft.com/en-us/azure/communication-services/acs-retirement-and-breaking-changes-guideSincronizzare scheda contatti dell'account di posta elettronica con active directory
Good morning, I need to update the mobile and office phone numbers for users in Active Directory and then synchronize them with the contact information in their email accounts. The goal is to ensure that when a user types an email address in Outlook and hovers their mouse over it, the phone and mobile numbers are visible in the contact card.
