How to Fix Exchange Archive GUID and Mailbox Alias Sync Errors
Question details
The user needs to resolve an Active Directory and Microsoft 365 synchronization error regarding the Archive GUID and Mailbox Alias.
- Product
- Microsoft Exchange
- Device & OS
- not provided
- Scenario
- Synchronizing an on-premises archive mailbox with Exchange Online via Azure AD Connect.
- Observed behavior
- Archive GUID values mismatch between the remote mailbox and Exchange Online, resulting in a synchronization error, often incorrectly referencing the DisabledArchiveGuid instead of the active archive GUID.
Before proceeding, ensure you have administrative access to both the on-premises Exchange Management Shell and Exchange Online PowerShell, and verify that Azure AD Connect is functioning.
Compare and Resolve Archive GUID Mismatches Using PowerShell
Use PowerShell commands to verify the Archive GUIDs on both environments and manually trigger a delta sync after correcting aliases or disabling archives.
For a synchronized mailbox with an on-premises archive, the archive GUID values must match correctly between the remote mailbox and Exchange Online. Relying on DisabledArchiveGuid is incorrect for an active archive.
Open the Exchange Management Shell on your on-premises server and run 'Get-RemoteMailbox user | Format-List' to locate the current ArchiveGuid value.
Connect to Exchange Online PowerShell and run 'Get-Mailbox user | Format-List'. Compare this ArchiveGuid value with the one obtained from your on-premises server.
If necessary, change the mailbox alias on-premises to trigger an attribute update in the directory.
Run the command 'Start-ADSyncSyncCycle -PolicyType Delta' on your Azure AD Connect server to push the new synchronization changes to the cloud.
If the on-premises archive must be completely disabled to clear the conflict, execute the command 'Disable-RemoteMailbox "user" -Archive'.
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Frequently Asked Questions
Why does an Archive GUID mismatch occur during synchronization?
This mismatch typically happens when an archive mailbox is enabled directly in Exchange Online instead of being provisioned on-premises, or if the user object was recreated, causing the on-premises ArchiveGuid attribute to differ from the cloud's record.
What is the role of DisabledArchiveGuid in Exchange?
The DisabledArchiveGuid parameter stores the GUID of an archive mailbox that has been disabled or disconnected. It should not be matched or used for an active archive during a normal synchronization process.
How do I force an Azure AD Connect synchronization?
You can force a delta synchronization by running the PowerShell command 'Start-ADSyncSyncCycle -PolicyType Delta' on the server hosting Azure AD Connect. This pushes the latest attribute changes, including mailbox aliases and GUIDs, to Microsoft 365.
