Some source mailboxes are merged into one target mailbox after you use a Move-Mailbox cmdlet to migrate the mailboxes from an Exchange Server 2003 organization to an Exchange Server 2007 organization

You use a Move-Mailbox cmdlet to migrate the mailboxes from a Microsoft Exchange Server 2003 organization to a Microsoft Exchange Server 2007 organization. To speed up the migration process, you run a migration script that executes multiple parallel processes with the Move-Mailbox cmdlets on the Exchange servers. However, duplicate aliases exist after the migration process. Additionally, multiple source mailboxes are merged into one target mailbox.

During the migration process, the script creates the migstubXXXX temporary alias. The temporary alias includes a four-digit number that is generated randomly. When the problem that is described in the "Symptoms" section occurs, multiple source mailboxes share the same alias. This behavior causes one target mailbox to hold the contents of the multiple source mailboxes.

To resolve this problem in Exchange Server 2007 Service Pack 1, install Update Rollup 1 for Exchange Server 2007 Service Pack 1. For more information about Update Rollup 1 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: To resolve this problem in the release version of Exchange Server 2007, install Update Rollup 6 for Exchange Server 2007. For more information about Update Rollup 6 for Exchange Server 2007, see the following Exchange Help topic: For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:

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

For more information about the Move-Mailbox cmdlet, visit the following Microsoft Web site: