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Exchange 2010 to Exchange 2010 migration

Posted on 2012-09-01
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Hi experts,

I do have get a few questions related to a migration between Exchange 2010 , source server running on domain A to a new Exchange 2010, destination server, setup running on domain B.
First of all: the trust between the both domains is already in place and working properly (by using ADMT).
Mail flow from and to the destination server has been tested and works properly.
Next step will be the migration of the mailboxes from source server to destination server (by using PrepareMoveRequest.ps1).

Questions I do have:
1) While migrating a mailbox: what will happen with the incoming mail for that particular mailbox, will it be delivered into the mailbox on the destination server after the migration ?

2) As long as you don’t click on the remove move request (after migration), will the original data of the mailbox reside on the source  server (it’s obvious we can’t afford to lose any data  at all) ?

3) While the migration process takes places, there will be users with mailboxes on both servers.
Are there any additional next steps required to route mail properly between servers (by using routing groups) ?

Example: User A (still on source  server, domain A), sends a mail to user B, who is already migrated (on destination server domain B), will user B receive that internal mail ?

4) Same question goes for user B (on destination server) mailing to user A (on source server) ?

5) Final question, what with the external mail for user B (on destination server), MX records will be left alone, during migration, so pointing to the source server, will the source server automatically deliver the mail to the destination server ?

Many thanks for clearing out my questions, although we did several Exchange migrations, the end client allowed a disturbed mail flow (mail was filtered / kept for delivery by using a SPAM firewall, so no mails where lost), in this case a disturbed mail flow is not allowed , only an temporary “offline” user mailbox during its particular mailbox migration.
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Question by:willux
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flaphead_com earned 2000 total points
ID: 38357284
So let me try and answers

1) Incoming mail will be delivered to the soure (original) mailbox until the move complete

2) Once the mailbox is migrated, the source mailbox will be deleted and the destination will be active.  All the remove-moverequest cmdlet does it remove a record from the ad account.  It does nothing with the source mailbox.  If you need to recover the source mailbox, you can do that depending on the duration of the source exchange 2010 deleted mailbox retention period

3) During migration the destination mailbox is not available to login in to.  Once the mailbox has moved, the user who is connected to the source mailbox will get an outlook prompt saying the administrator has made a change and to logout and back in to the outlook.  When they login they will be conneced to the destination mailbox.  All email will be sent to the source mailbox until the move is complete

4) / 5) once the mailbox has switched from source to destination, the ad will be updated and mailflow queries the ad for the mailbox location.  So once the move is complete all mail goes to the destination mailbox

Hope that helps
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