Microsoft 365 – What To Do When the Mailbox is Full

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Whether you manage your mailbox well or not, there is a good chance where your mailbox will eventually fill up. When that happens, you can go through the options trying to clean up again. But a better option here is to utilize the Online Archiving feature that Microsoft 365 offers out of the box for free that provides users with additional mailbox storage space.

Once you turn on the archive mailbox, you immediately got up to 100GB of additional storage available to you. And when that additional storage runs out, Microsoft 365 automatically adds more storage space to your archive until the total size reaches 1.5TB. And that is plenty.

To enable the archive mailbox for a specific user:

Enable-Mailbox $userid -Archive

And to enable it for all users that don’t have the archive feature enabled,

Get-Mailbox -Filter {ArchiveGuid -eq '00000000-0000-0000-0000-000000000000' -AND RecipientTypeDetails -eq 'UserMailbox'} | Enable-Mailbox -Archive

Once done, you will see an additional mailbox called Online Archive automatically showing up in Outlook or Outlook Web Access. You can manually move or copy messages between your primary mailbox and the archive one. Or, simply let the retention policy that is set in place take care of the business for you.

And the nice about it, you can easily search for it by simply switching the search option from Current Mailbox to All Mailboxes.

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Even though the retention policy will kick in right away, you won’t see the actual archiving process happen right away. It is managed by the Managed Folder Assistant but if you can’t wait and would like to see that happens right away,

Start-ManagedFolderAssistant -Identity $userid

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