Hi, i am in a project to setup a new AD domain forest for company B which gets separated from company A. Once the forest for company B is setup, move ' X' number of user accounts and associated objects  to Company B domain with trust established. Company B may go for managed exchange or onpremise exchange.

1.What are the key aspects to be considered while deploying new AD forest , keeping exchange in mind.

2. What is the suggested migration strategy? Can we migrate user accounts and computers first  prior to exchange mailbox migration?

3. Should we disable SID filtering prior to 2 way trust as company B still need to access resources in company A?

Any detailed pointers on above will help.

Hi,

I recommend you refer to the following article

http://blogs.technet.com/b/meamcs/archive/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i.aspx

Thanks.