AD Migration of two Domains (Company A buy Company B) - Hints & Infos?

Dear all

i would like to get some helpful infos for an upcoming discussion regarding the migration of two companies into one (AD, Exchange, FileServices, etc).

Situation: Company(A) which will remain as it is, did buy Company(B).
They have an Exchange Server (about 150 Users), AD FileServers, cifs file share on an storage system, Workstations, etc. The usual IT stuff.

At the end scenario all users from Company B needs to be integrated into our Company with AD Accounts, Mailboxes, etc.

Is there a best practice way to integrate all the mailboxes, ad accounts, group membership, etc. into our domain?

I was thinking about to establish an AD trust between the two domains and migrate the users via ADMT.  All Users of Company-B will anyway get an new workstation with our build so i don't care about this, also all the network stuff i don't care - because we will get rid of it as some point and just use ours.  I just like to know some possible scenarios to migrate all the Users and Mailboxes into our Systems relative painless. The migration should be finished within three months.

May some guys here already did that and can give me some hints, ideas / facts? Links to good documents?

thanks in advance!
digifineEFXAsked:
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Mike KlineCommented:
The ADMT white paper is the first place you want to check out

http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=19188

It is long but has a lot of great information.  

The exchange team had a good writeup on the mailbox moves with Exchange 2010  http://blogs.technet.com/b/exchange/archive/2010/08/10/3410619.aspx

I have not done it with a E2K10 migration yet.  Try to have the users offload as much mail as they can to a PST so you have less data to migrate for exchagne.

Thanks

Mike
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digifineEFXAuthor Commented:
Hi, thanks for the comment - yes, looks like i going as I mentioned in my question with admt tool ...
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