How to copy mailboxes from Exchange 2003 to Exchange 2007 across forests?

Posted by Tor Ivar Larsen on Server Fault See other posts from Server Fault or by Tor Ivar Larsen
Published on 2009-10-15T16:20:59Z Indexed on 2010/03/20 7:01 UTC
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exchange-transition

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exchange-2007

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exchange-2003

Hi.

Were going through a quite difficult conversion from an old ASP-solution to an entirely new one. This includes moving mailboxes from Ex2003 to Ex2007. We want to do this without deleting the old mailboxes on the Ex2003 server, to have a "fall back" in case somehing goes wrong.

I have investigated the "Move-Mailbox" cmdlet in the Ex2007 shell, and it seems to fit our needs quite well. The only problem being that we want to keep the old mailboxes. This could easily be accomplished with the -SourceMailboxCleanupOptions, but we can't use this when we have used the -AllowMerge switch.

The reason we need -AllowMerge is because all the user accounts with connected mailboxes are already created on Ex2007(Some automatic user creation tool, no real relevance to the case in question)

The twist is that the exchange servers are in two different forests...

Windows 2003 SP1 on DC1, Windows 2003 SP2 on DC2 in forest 1. Windows 2003 R2 SP2 on DC1 in forest 2.

Can we use the Move-Mailbox safely for this purpose? And if yes, how?

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