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I got 2 Exchange 2010 in different domain, say Domain A & Domain B (different server, different network segment).

I want to move the mailbox from Domain A to Domain B. What should I do?

p.s. emails going to move to domain B has been moved to a separated mailbox database.

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All the mailboxes, or just one or two? – Ward Oct 29 '10 at 5:57
3 mailbox databases containing 100, 50 & 20 mailboxes respectively. Planned to move the databases containing 50 & 20 mailboxes. The 100-mailbox database will leave in old server. – Raptor Oct 29 '10 at 9:01
up vote 1 down vote accepted

I see the question is somewhat dated, but this might be of some use to others: as you have two exchange organizations, you would not be able to simply move the mailboxes across. I believe the only supported way would be to export the mailboxes on the source server and import them on the destination server.

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This question has quite different answers if the two servers are in the same Exchange organization or not. Please provide this info.

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different Exchange organization. – Raptor Oct 29 '10 at 9:02
@Massimo, Don't recall Microsoft was able to support 2 Exchange orgs in one domain. Yes for forest, but NO for domains. – Vick Vega Aug 18 '11 at 1:59
@Vick: I was talking about the opposite scenario: two domains, same forest, same org. – Massimo Aug 18 '11 at 6:24

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