When creating and applying retention policies to mailboxes, either in Exchange or Office 365, we must force the application of the policy assigned to a mailbox or nothing will happen.
If we have mailboxes in an on premise Exchange server, the Exchange Management Shell must be used. When mailboxes are in Office 365, we must connect to the Office 365 tenant using the Azure AD PowerShell module.
While using the appropriate management tool, run the following command replacing “USER_ALIAS” with a valid mailbox alias (i.e. “johndoe”)…
Start-ManagedFolderAssistant –Identity “USER_ALIAS”
After running the command for the individual target mailbox(es), wait about 30-60 minutes. If items are not removed from the inbox and/or do not show in the archive after 60 minutes, run the command again.
If you need to enforce policies for all mailboxes that have been assigned a retention policy, run this command…
Get-Mailbox -ResultSize Unlimited | Start-ManagedFolderAssistant
Either one of these commands must be run after assigning or reassigning retention policies for any mailbox.
Good luck and have fun!
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