Default folders are duplicated after you migrate mailboxes to Exchange Server 2013

Applies to: Exchange Server 2013 EnterpriseExchange Server 2013 Standard Edition

Cause


This issue occurs because of some unhandled errors during the mailbox migration process.

Resolution


To prevent this issue in a migration, install the following cumulative update:

Note
Users who have already had folders duplicated have to remove them manually.

Status


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.