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Moving Mailboxes between Forests/Domains

Posted on 2010-11-16
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Last Modified: 2012-05-10
We are doing a total domain migration after experiencing numerous, never-before-seen problems with our AD (problems that Microsoft told us we were out of luck on).  As part of this process we need to move all mailboxes to the new domain.  To our understanding this is best done with either the Exchange Migration Tool or ExMerge.  We have had little success with either.  Does anyone know the best order in which to use ADMT 3.2, Exchange Migration Tool and/or Exmerge to move mailboxes between forests and servers?

Here is some more information regarding our network:
Exchange 2003
AD is fully 2008 R2
Everything is running (in relation to this problem) on VMware ESX/ESXi
Domain name of old domain is 'companynameglobal.com'
Domain name of the new domain is 'companyname.lcl'
The DNS suffix we use for all our email addresses is 'companyname-global.com' (Notice the hyphen)
Notice that these are not in the same forest at all
The 2 forests are setup with a 2-way external non-transitive trust
We've followed ADMT steps and haven't had any problems that we need help with in the ADMT process
DNS conditional forwarders have been setup between domains and all DNS routing is working just fine
The Exchange servers are not configured to route mail between them at all

We need any solution (that doesn't include buying Quest Software's $$$ solution) that will allow us to migrate as transparently as possible across these domains/forests.  As we have only a small staff overseeing 100+ users (many of them remote) we won't be able to tolerate a large scale (big downtime) transition.

All comments welcome!
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Question by:ChocolateRain
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by:vanbarsoun
ID: 34150356
What is the exact problem you're having? Are the accounts not being migrated over successfully?
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by:ChocolateRain
ID: 34150495
If we migrate the mailbox first using ExMerge then we have a problem because the user won't receive any mail on their account has this server that we're moving to isn't tied into the mail flow that comes in from the internet.  As we have 100+ users this isn't an option UNLESS we can have the other server (on another forest)  tied into the mail flow.  If that is possible that is great, we just need to know how to set it up.

If we migrate the user and then try and move the mailbox over with Exmerge it keeps the old Exchange server as its Exchange 'home server' and we're unable to upload to it's mailbox on the new Exchange server because it doesn't have one.
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by:vanbarsoun
ID: 34150754
I believe you can enter the IP of the new Exchange server in your current SMTP virtual server properties>Messages tab>"forward all mail with unresolved recipients..." setting, so this way inbound mail flow will remain the same but migrated accounts will still be able to receive email until all accounts migration (and external mail routing) is complete.

It's been  a long time since I've done a migration so perhaps someone else can verify, but you can perform a test with a dummy account to verify.
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by:ChocolateRain
ID: 34166481
I tried sending this user "Jon Smith" an email while he was on the new Exchange server on the new and seperate forest from both my internal account (resident on the other forest's exchange server) and from my gmail account with the  the "forward all mail with unresolved recipients" setting both off and on.

These were my results:


Sent internally with "forward all mail with unresolved recipients" filled out to the server on the other forest: success
Sent internally with "forward all mail with unresolved recipients" blank: success
Sent from Gmail to Jon Smith while "forward all mail with unresolved recipients" setting blank AND/OR filled out correctly: failure with the below message:

Delivery to the following recipient failed permanently:

    jon.smith@companyname-global.com

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 553 553 mailbox jon.smith@companyname-global.com is restricted (Mode: normal) (state 14).
MIME-Version: 1.0
Received: by x.x.x.x with SMTP id gq4mr755896qcb.297.1290101230889; Thu,
 18 Nov 2010 09:27:10 -0800 (PST)
Received: by x.x.x.x with HTTP; Thu, 18 Nov 2010 09:27:10 -0800 (PST)
Date: Thu, 18 Nov 2010 09:27:10 -0800
Message-ID: <AANLkTinoOnMtO18mVpS2-x6VR_gc5=QXj6MY4J1GFs6P@mail.gmail.com>
Subject: test to jon smith from gmail
From: Matt Jones <matt.jones@gmail.com>
To: jon.smith@companyname-global.com
Content-Type: multipart/alternative; boundary=0016363100f397690f0495571905

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vanbarsoun earned 500 total points
ID: 34174871
Did you enter the IP address of the new exchange server enclosed in brackets [] in the forwarding setting text box?
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