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About Moving or Deleting Mailboxes for SSSE Users
From time to time, you might have to move users' Microsoft Exchange mailboxes from one Microsoft Exchange Server to another, or you might have to delete a user's Microsoft Exchange mailbox. (If you delete a user's Exchange mailbox, also disable the user for synchronization.) When this situation occurs for an SSSE user, simply follow Microsoft's guidelines for moving or deleting a user's Microsoft Exchange mailbox. No additional steps are required for SSSE users.
NOTE: SSSE does not support moving user mailboxes to an earlier release of Microsoft Exchange Server, for example, do not move user mailboxes from a server running Exchange Server 2010 to a server running Exchange Server 2007. Moving user mailboxes to later releases of Microsoft Exchange Server is supported by SSSE and additional configuration is not required.