Fix Outlook Showing On-Premises Mailbox After Delegate Permissions Removed
Question details
Outlook Autodiscover incorrectly returns an on-premises mailbox after delegate permissions have been removed in a hybrid Exchange environment.
- Product
- Microsoft Outlook / Exchange Server
- Device & OS
- not provided
- Scenario
- Managing delegate permissions and directory synchronization in a hybrid Exchange 2016 and Microsoft 365 setup.
- Observed behavior
- The on-premises mailbox continues to appear in the alternativeMailbox section of Outlook Autodiscover despite permissions being removed and directory synchronization appearing correct.
Ensure you have administrative access to both the on-premises Exchange Server and the Microsoft 365 admin center, and verify that Azure AD Connect recently completed a successful sync cycle.
Verify Autodiscover Output and Consult Exchange Specialists
Since this involves complex hybrid configurations and Azure AD Connect attributes, reviewing the Autodiscover output and consulting dedicated forums is the most effective approach.
In a hybrid Exchange environment, delegate permissions and mailbox mapping rely heavily on directory synchronization. If an on-premises mailbox still appears in the alternativeMailbox section of Autodiscover, it is likely due to stale delegate data or synchronization delays that require administrative intervention.
Run an Autodiscover test via the Microsoft Remote Connectivity Analyzer or by holding the Ctrl key, right-clicking the Outlook tray icon, and selecting 'Test E-mail AutoConfiguration'.
Review the generated XML output and locate the alternativeMailbox section to confirm if the stale on-premises mailbox data is still being broadcasted to the client.
Check the synchronized attributes, such as msExchDelegateListLink, in your local Active Directory to ensure that the removal of permissions has correctly updated the backend attributes.
Gather the relevant Autodiscover output and synchronized attribute values, and post the issue in the dedicated Microsoft Exchange Server administration forum so Exchange specialists can investigate the stale data.
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Frequently Asked Questions
Why does an on-premises mailbox still appear in Outlook after permissions are removed?
In hybrid environments, changes made to delegate permissions might not fully synchronize immediately, or stale attributes like msExchDelegateListLink may remain cached in Autodiscover, causing Outlook to still see the old mailbox.
How can I test Outlook Autodiscover in a hybrid environment?
You can use the 'Test E-mail AutoConfiguration' tool within Outlook by holding Ctrl and right-clicking the Outlook tray icon, or use the Microsoft Remote Connectivity Analyzer online to pull the Autodiscover XML.
Does Azure AD Connect automatically remove stale delegate attributes?
Azure AD Connect typically syncs all directory changes, but if the source Active Directory retains old values or if there is a synchronization conflict, the attributes might not update correctly in Exchange Online.
Where should I report complex hybrid Exchange Server bugs?
Issues involving deep hybrid configurations and Azure AD Connect should be posted in the dedicated Microsoft Q&A Exchange Server administration forum, where specialized support engineers can assist.
