Microsoft Exchange – Removing an Auto-Mapped Mailbox from Outlook

1. Use Get-MailboxPermission to verify the permission level

Get-MailboxPermission -Identity "Mailbox Name" -User username | fl

2. Next, use Remove-MailboxPermission to remove the mailbox permission for the user.

Remove-MailboxPermission -Identity "Mailbox Name" -User username -AccessRights FullAccess

3. Re-add the mailbox permission with the -AutoMapping switch

Add-MailboxPermission -Identity "Mailbox Name" -User username -AccessRights FullAccess -AutoMapping:$false

4. Allow some time for user to pickup that via Outlook Autodicovery

5. To view the list of auto-mapped users for a mailbox run:

Get-ADUser -Filter {Name -eq "Mailbox Name"} -Properties msExchDelegateListLink | Select -ExpandProperty msExchDelegateListLink


Source: here

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