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Expert advise wanted: AD and Exchange interforest migration steps

Posted on 2013-05-28
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Last Modified: 2013-11-24
Hi there
Just so I have all my ducks in a row, i need to do a interforest AD migration from 2003 to 2012 and also the cross forest migration of Exchange from 2003 to 2010 and eventually 2013. I am looking to confirm my intentions by asking for recommendations, very high level steps, as to the best way to approach this "beast". I am hoping it is really tame, and not to much of an issue to get done.
Only to use ADMT and exchange powershell to do this. No 3rd party tools.

Jafar54
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by:Ben Hart
ID: 39202688
The AD side:  You cannot do in-place upgrades of 2003 to 2012.  You will need to configure and introduce new 2012 Domain Controllers.  With the addition of the first 2012 server you will upgrade your Schema.. move all your FSMO roles to the new server then individually decommission your 2003 DC's.

Then upgrade you could introduce the new Exchange 2010 server, following any of the MANY excellent guides online.  Once your Exchange environment is migrated over and your 2003 server is removed from the org you can then increase your functional level to 2008 or beyond.
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by:Ben Hart
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jafar54 earned 0 total points
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As per my question, the intention is migrating to a new forest, not in the same forest. I am looking for actual info, nt just urs to have to go read and extract info....

Like,

Create DNS stubs
Establish 2way trust
Add source forest admin account into target forest administrator's group, vice versa
Install ADMT into target forest
Install PES into source forest
Install and configure Exchange 2010 into target forest

Then what? What is the best route to follow to migrate AD and mailboxes that will allow for a stage migration and not a Big Bang?
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