Scenario: When attempting to create an archive mailbox for an Exchange 2013 mailbox, the following error is displayed:
Mailbox ‘user1’ can’t be archive-enabled because it has a managed folder policy assigned. Archives are supported only with a retention policy, the message records management feature introduced in Exchange 2010.
Resolution: Although you can see the ManagedFolderMailboxPolicy property for a mailbox, Exchange 2013 does not support Ex2010 MRM and it ignores its functionality. By attempting to set the managedfoldermailboxpolicy to null, it would not do anything on the mailbox:
set-mailbox user1 -managedfoldermailboxpolicy $null
A work around is to add a temporary retention policy to the mailbox and remove the retention policy:
set-mailbox user1 -retentionpolicy “My Retention Policy”
set-mailbox user1 -retentionpolicy $null
When you add a retention policy to the mailbox, it automatically nulls out the managedfoldermailboxpolicy value. By setting the retention policy back to null, it removes the 2013 retention policy completely as well. You will now be able to create a archived mailbox for that user.
Ex-Shell 
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