Exchange 2010 Mailbox can’t be archive-enabled due to managed folder mailbox policy

In Exchange 2010 you might want to enable archiving for a user but run into the following error:

To remove the managed folder mailbox policy from the mailbox run the following command from the Exchange Management Shell:

• Set-Mailbox <User> -ManagedFolderMailboxPolicy $null

You should now be able to enable archiving for the user.

Hope it helps.