I need a council. I have 2 different AD with Windows 2003 and 2 Exchange servers (2003 and 2010) each with a different domain. I unify everything and to do this we will create a new domain, but the exchange servers must continue as now ( @domain1, @domain2). 1.- That i consulted to do? 2.- It is very problematic? Thanks

if you are merging both the domains then you may use GAL segregation in exchange 2010 sp2 to achieve separating those users in both the domains

I'm assuming you have 2 different AD forests\Exchange orgs and you want to collapse\merge both into a single forest\exchange org. If this is the case it will be a complex process because you're looking at setting up the infrastructure to migrate your 2003 to the new 2010 org as well as your existing 2010 org to the new 2010 org. You will need to set up interm co-existence for smtp routing, free busy, OWA etc. There's is alot of steps involved to be explained on a simple forum. James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

I'm assuming you have 2 different AD forests\Exchange orgs and you want to collapse\merge both into a single forest\exchange org. If this is the case it will be a complex process because you're looking at setting up the infrastructure to migrate your 2003 to the new 2010 org as well as your existing 2010 org to the new 2010 org. You will need to set up interm co-existence for smtp routing, free busy, OWA etc. There's is alot of steps involved to be explained on a simple forum. James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Hello, I unify everything and to do this we will create a new domain, but the exchange servers must continue as now ( @domain1, @domain2). Yes, you can migrate these two forests\two Exchange Servers to one forest\ two Exchange Servers, but I am sue what is your meaning of "but the exchange servers must continue as now ( @domain1, @domain2). ", could you explain it in detail. Thanks, Evan Evan Liu TechNet Community Support