Account locked
I am the business owner and the only Global Administrator of my Microsoft 365 business tenant. I am completely locked out of my administrator account because Microsoft Authenticator is not working correctly. When I try to sign in, Microsoft offers only two authentication methods: Approve a request in Microsoft Authenticator. Enter a verification code from Microsoft Authenticator. Neither method works. The Authenticator app displays an 8-digit code, but Microsoft requests a 6-digit code. I have no alternative authentication method available, and I cannot access the Microsoft 365 admin centre to reset my MFA settings. Please escalate this case to the Microsoft Data Protection team for sole Global Administrator account recovery and MFA reset. I can provide the necessary evidence to verify my identity, business ownership and tenant ownership.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.
Staff Email hacked Restored but not able to receive any emails
Could you please advise on the best way to restore emails for a staff member whose email account was recently compromised? I am the account administrator and am trying to recover any missing messages and verify mail flow. I have already used Message Trace, but I can't locate a test message I sent to the user. Any guidance on the appropriate recovery steps or troubleshooting recommendations would be greatly appreciated. Thanks
Business Standard with Exchange Plan 2 NOW only showing 100GB of email space
FOR THE PAST 3 YEARS, we have 15 users with Microsoft Business Standard with 100GB of email storage space and 11 with Microsoft Business Premium with 100GB of email storage. I have 1 Business Standard with Exchange On-line Plan2, and 1 with Exchange On-line Plan2. Both have always jhad 150GB of usable mailbox storage. Both users for several years, leading up to September 18, 2026 had over 100GB of mail in their mailboxes and had no problems sending or receiving email, ever. THEN ALL OF THE SUDDEN on 9/18/2026, these 2 users with Plan 2 are no longer able to receive any email and it now shows their mailbox is full Even though checking active users details about mail for both of these users shows 150GB storage. In investigating further, in the exchange area of the admin portal, checking mailboxes indeed both of these 2 USERS ONLY SHOW 100GB, which is the exact same as all my other users who are not paying for Exchange PLAN 2. HOW DO I REPORT this to Microsoft?
IMAP Mail Migration
Hello Microsoft Community, We are currently performing a mailbox migration from Google Workspace (Gmail) to Microsoft 365 Exchange Online using the IMAP migration method. The customer's environment is configured for split routing/coexistence, where both Google Workspace and Microsoft 365 are actively being used during the migration process. Mail flow is functioning as expected; however, we are experiencing extremely slow migration performance. For example, a mailbox containing approximately 10 GB of data is taking nearly two weeks to migrate, which is significantly impacting the overall project timeline. We would appreciate guidance on the following: Is this migration speed expected when using the IMAP migration method from Google Workspace to Exchange Online? Does Exchange Online enforce any throttling limits that can affect IMAP migration throughput? Can split routing or coexistence between Google Workspace and Microsoft 365 impact IMAP migration performance? Is there a recommended number of concurrent mailbox migrations or migration batch size for optimal performance? Are there any Google Workspace-side limitations, API restrictions, or throttling settings that should be reviewed? What Microsoft-recommended configurations or best practices can help improve IMAP migration speed? If higher migration throughput is required, does Microsoft recommend an alternative migration approach instead of IMAP? If split routing/coexistence must remain active throughout the migration project, what is the recommended Microsoft-supported migration method? We are trying to identify whether the bottleneck is on the Exchange Online side, Google Workspace side, or related to the coexistence configuration. Any troubleshooting guidance, performance recommendations, or Microsoft documentation references would be greatly appreciated.
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?
550 5.7.705 Tenant Email Block 55+ Hours - Support Unresolved
Our M365 tenant (labaradorpake.onmicrosoft.com) has been blocked from sending outbound email for over 55 hours with error 550 5.7.705 Access denied, tenant has exceeded threshold. Despite multiple support tickets and promises of 24-hour resolution, the block remains active. **Error Details:** - NDR: 550 5.7.705 Access denied, tenant has exceeded threshold - Scope: External outbound email only is blocked; internal tenant-to-tenant email works fine - Microsoft Defender Restricted Entities page shows 0 restricted users — the block is at tenant level, NOT user level - No transport rules exist that could be blocking outbound - No alerts in Exchange Admin Center **Timeline:** - June 19: Support ticket #2606190040005588 created, agent Manisha confirmed remediation complete and promised block would be lifted within 24 hours - June 21 (55+ hours later): Block STILL ACTIVE. Manisha has not responded to follow-ups. - June 21: Created 2nd ticket #2606210040000778, assigned to agent Odunayo — no action taken - June 21: Created 3rd ticket #2606210040000844 with phone callback request — no callback received yet **What we have tried:** 1. Three Microsoft support tickets (all Sev C) 2. Escalation emails to agent, tech lead, team manager (all bounce due to tenant block preventing outbound email) 3. Support Assistant chat bot — cannot escalate to human agents 4. Azure Portal support — No Access for this tenant tier 5. getsupport.microsoft.com — No Access 6. Microsoft Learn Q&A post: https://learn.microsoft.com/en-us/answers/questions/5926147 7. Phone callback requested on 3rd ticket — still waiting **Critical Impact:** The tenant cannot send ANY external email. All outbound messages to external recipients bounce with 550 5.7.705. This is a complete business email outage that has persisted for over 55 hours despite Microsoft support confirming remediation was complete. Has anyone experienced a similar tenant-level block (550 5.7.705) that took this long to resolve? What escalation paths actually work when support agents are unresponsive? Any advice on getting this block lifted urgently would be greatly appreciated. Cross-posted from Microsoft Learn Q&A: https://learn.microsoft.com/en-us/answers/questions/5926147
Exchange 2010 to Microsoft 365 Migration – Recommended Approach and Tools
I’m looking for guidance on migrating Exchange 2010 (on-premises) to Microsoft 365 / Office 365. Is a direct migration from Exchange 2010 supported, or is an intermediate hop (such as upgrading Exchange or setting up a hybrid configuration) required? Additionally, could you please recommend any reliable tools that can help with this migration? I also have a few PST files that need to be migrated as part of the process. I’d appreciate insights on best practices, common challenges, and lessons learned from real-world migrations. Thanks in advance for your help.
IMAP Migration from Google Workspace to Microsoft 365
Hello Team, Greetings!! We have recently been experiencing significant delays during IMAP migrations from Google Workspace to Microsoft 365 and would like to understand if there are any known issues or recent changes affecting IMAP migration performance. We are aware that Microsoft provides the native Google Workspace migration method, which would generally be preferable. However, in our migration scenarios, we have split routing/coexistence configured, with the domain configured as Internal Relay in Exchange Online. Because of this setup, we are currently unable to select/configure the required target delivery domain as expected during the native Google Workspace migration process. Could you please confirm: Whether there are any known issues, throttling, or performance degradation with IMAP migrations from Google Workspace to Microsoft 365 recently? Whether the Internal Relay/split-routing configuration can affect the native Google Workspace migration process or the availability of the target delivery domain option? Is there any recommended configuration or workaround that would allow us to use the native Google Workspace migration while maintaining split routing? Any guidance or recommended approach would be highly appreciated.Cross-tenant Migration
Hi all, I will be doing migration from existing tenant to a new one soon. I've recently completed IMAP migration to Exchange online, and also Google Workspace Migration to Exchange online.... So I thought that cross-tenant will be the easiest one as it is all under MS.... Looks that I was wrong, and seems to be quite the most challenging one 🙂 Few details first - there is a COMPANY-A tenant. There is also COMPANY-B domain created in that tenant . Now, COMPANY-B is going to move to a new tenant and keep the name. It will be only 15 users, so not a huge amount. So, I can see that there is a Cross-Tenant migration option available in EAC, so I want to use it. It does look a bit complicated anyway. What I'm trying to confirm/clarify is: Is the Cross-Tenant Migraiton option in EAC the one that I can use for my scenario? Checking https://docs.microsoft.com/en-us/microsoft-365/enterprise/cross-tenant-mailbox-migration?view=o365-worldwide . It seems to be however a bit of work in powershell etc (I'm not expert with powershell). Is this the only and easiest way to do the migration? 🙂 Anyone has any guide on "step-by-step" that I could have a look? Would help me a lot. Are there any "tricky" parts that I should be aware of during migration? Ppl that already used this way to migrate PS: For SharePoint migration, I will use Migration and Mover that is abailable for via SharePoint... which seems to be quite straight forward. Any info that will help me to prepare for the move would be much appreciated.
