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Exchange 5.5 to 2003 migration while in mixed mode NT4.0/2003 domain

I'm a bit confused by Microsoft's documentation when it comes to migrating exchange versions while in a mixed mode domain.  Is it possible to sandwich an exchange migration in the middle of the domain migration…after we have a 2k3 running in mixed mode with NT 4.0 BDCs, but before we’ve raised the domain functional levels?

Right now our strategy is to get the domain in mixed mode via the standard procedure of upgrading a temporary PDC to 2k3.  Then we'll move that machines PDC functionality to the permanent 2k3 machine via dcpromo.  So at this point we'll be in mixed mode, can I go through the "Standard Deployment Method" for 5.5 to 2k3, i.e. link the new win 2k3/exchange 2k3 machine to the existing 5.5 box and start moving mailboxes.

I have all of the documentation for both procedures, just haven't heard or seen any thing about people doing them concurrently.  Honestly, I can't see an alternative method with all of the ancillary services we have running off of the existing exchange server, so any advice would be greatly appreciated.
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PatGroupIT
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PatGroupIT
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1 Solution
 
ppuroCommented:
Hi,

First of all make sure you move all your users from NT domain to W2K3 domain.

We always recommend following the EXDEPLOYMENT TOOLS and ADCTOOLS to avoid the migration issues.

Check the links below for your reference :

A comparison of the migration methods from Exchange 5.5 to Exchange 2000/2003
http://support.microsoft.com/kb/327928/en-us

 
How to setup the Active Directory Connector
http://support.microsoft.com/kb/823601/en-us
 
·       How to roll back a failed migration from Exchange Server 5.5 to Exchange 2000
Server or to Exchange Server 2003:
http://support.microsoft.com/default.aspx?scid=kb;en-us;839356
 
 
 
 
Setup of New Server
 
Exchange 2000 Server and Exchange Server 2003 setup and installation top support issues
http://support.microsoft.com/kb/292757

 
1.      Considerations when you upgrade to Exchange Server 2003
http://support.microsoft.com/default.aspx?scid=kb;en-us;822942
 
 
2.      Common Mistakes When Upgrading Exchange 5.5/2000 To a Exchange 2003
http://support.microsoft.com/default.aspx?scid=kb;en-us;555262
 
3.      Exchange Server 2003 Deployment Guide
http://www.microsoft.com/technet/prodtechnol/exchange/2003/Library/DepGuide.mspx
 
 
4.      Upgrading Exchange Server 5.5 to Exchange Server 2003:
http://www.microsoft.com/technet/community/events/exchange2003/tnt1-100.mspx
 
5.            Exchange 2000 Server and Exchange Server 2003 setup and installation top support issues (292757) –
http://support.microsoft.com/default.aspx?scid=kb;en-us;292757
 
 
6.      How to Verify That ForestPrep and DomainPrep Completed Successfully in Exchange 2000 Server or Exchange Server 2003
http://support.microsoft.com/default.aspx?scid=kb;en-us;274737
 
 
7.      Permissions that you must have to install components in Exchange Server 2003
http://support.microsoft.com/default.aspx?scid=kb;en-us;828765
 
8. How to configure a two-way recipient Connection Agreement for Exchange Server 5.5 and Exchange Server 2003 users (822921) -
http://support.microsoft.com/default.aspx?scid=kb;en-us;822921
   
9. Deploying the Active Directory Connector:
http://www.microsoft.com/technet/prodtechnol/exchange/2000/deploy/upgrademigrate/series/deploymentguide/d_03_tt1.mspx
 
 
10.   How accounts and mailboxes are created and mapped when you use the Migration Wizard to migrate from Exchange Server 5.5 to Exchange 2000 Server or to Exchange Server 2003:          
http://support.microsoft.com/default.aspx?scid=kb;en-us;281583
 
 
Moving Mailbox/Public Folders
 
1.      Moving mailboxes between servers:
http://support.microsoft.com/default.aspx?scid=kb;en-us;328810
 
2.      How to Rehome Public Folders in Exchange 2000/2003
http://support.microsoft.com/kb/288150/
 
 
Decommissioning Old Server
 
1.      How to remove the last Exchange Server 5.5 computer from an Exchange Server 2003 administrative group: (822450) -
http://support.microsoft.com/default.aspx?scid=kb;en-us;822450
 
2.      How to Remove the First Exchange 5.5 Server in a Site:
http://support.microsoft.com/kb/152959/
 
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PatGroupITAuthor Commented:
The 1st link under "Set up of new server" has this listed as one of the first steps:

•      Before you upgrade to Exchange Server 2003, make sure that your network and your servers meet the following system-wide requirements:
       •      Domain controllers are running Microsoft Windows 2000 Server Service Pack 3 (SP3) and later, or Microsoft Windows Server 2003.

Doesn't this mean the domain can't be in mixed mode?  Anyone have experience with this?
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ppuroCommented:
It can be definately mixed mode. No issues with that..

Regards,

Prasad
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PatGroupITAuthor Commented:
Thanks for all the links and the concise answer!  These will really help in the planning.
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