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


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


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

Cumulative Update 8 for Exchange Server 2013

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


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

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