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

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Exchange Server 2013 Enterprise Edition Exchange Server 2013 Standard Edition More...Less

Cause

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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