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.

  • All the mailboxes, or just one or two? Oct 29, 2010 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, 2010 at 9:01

2 Answers 2


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.


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

  • different Exchange organization.
    – Raptor
    Oct 29, 2010 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, 2011 at 1:59
  • @Vick: I was talking about the opposite scenario: two domains, same forest, same org.
    – Massimo
    Aug 18, 2011 at 6:24

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