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Inter-Forest Exchange 2003 vs Exchange 2007 Migration and Coexistence

Posted on 2009-05-11
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Last Modified: 2013-11-30
SCENARIO

- SOURCE:
    . Windows 2003 Active Directory Domain
    . Exchange 2003 SP2, Organization
     . Email Address (SMTP Default Policy)
      - user@domainSource.com
      - user@mail.com
           . SMTP Authoritative Domain)
           . (This Exchgange Organization is responsible for all mail
                              delivery to this address)

- TARGET
     . Windows 2008 new Forest and new omain
      . Exchange 2007 SP1 New Organization
         . Email Address:
               - user@domainTarget.com
               - user@mail.com    (This SMTP Address ha to be
                             shared between Orgiganization)
QUESTIONS:
- According that the  migration has to be executed in several steps, which means,
   that not all Users will be migrated in the same steps.
      
Q1- We need to understand which is the right Tool to migrate that mailbox
    from Exchange 2003 to Exchange 2007.
    I know that EMS (Exchange Managemnt Shell) cmdlet Move-Mailbox
    has this capability. Is it true ?
    If so, we need to set-up some connector between the two Exchange  Server.
    The Mbox Migrations Wizard embedded in the ADMT V3.1 is only
    for Exchange 5.5 Source mail server, iti is not the right one.
 
Q2- We need to configure both Mail Server (Source and Target) to share the
    same SMTP Domain: @mail.com
    Because some Users will still have Mailbox on the Source Mailbox Server (Exchange 2003)
    and some other will have not longer Mailbox on Exchange 2003, but only in the new
    Exchange 2007 Organization with the Mailbox Server.
    The only way that we found is in the Microsoft KB 321721
    (How to Share and SMT address space in Exchange...),
   changing the  Authoritative SMTP Adress form the SOurce to the Target.
   But we don't know whther o rnot after this modification on the source Exchange 2003
   Server the User that still on Exchange 2003 continue to work properly.
   The same doubt for Sending/Receinving Email between two User in the @mail.com, but
   with the Mbox in different Mail Server (e.g. Exchange 2003  and Exchange 2007).
 
Thanks for providing same suggestions.
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Question by:AnthonyFats
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2 Comments
 
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Accepted Solution

by:
Jamie McKillop earned 1500 total points
ID: 24377443
Hello,

Yes, you use the Move-Mailbox command. Here is a good tutorial on how to do cross-org mailbox moves: http://msexchangeteam.com/archive/2006/11/02/430289.aspx

Here is an article on how to setup a shared SMTP name space in Exchange 2007: http://www.msexchange.org/articles_tutorials/exchange-server-2007/planning-architecture/exchange-2007-smtp-namespace-sharing-different-relay-domain-types.html

After you set this up, you will need to change your MX records to point to the Exchange 2007 server.

To ensure mail flows properly after you migrate a user, you should create hidden contacts for all your mailboxes. Those contacts should have the SMTP address user@domaintarget.com. After you migrate a mailbox, set it to forward to the contact. This will ensure that users still on the Exchange 2003 server can send mail to users migrated to the Exchange 2007 server.

JJ
0
 

Author Closing Comment

by:AnthonyFats
ID: 31580075
For the 2nd QUestion "Sahred SMTP Domain", I applied the Microsoft KB321721 with some changes: (like that SMTP Domain, has to "NOT Authoritative" on the Source and on the Target.
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