We are merging with another company. The big question is, can we keep our AD environments separated (but with trusts), yet use 1 of the existing exchange environmnets.
Company A = ham.com
Company B = cheese.com
Cheese.com is going away. All employees of the combined company will get mail from ham.com. Can company B use company A's exchange server without doing a domian migration (just trust the forrests). And can we do it with single sign on or will company B have to login to outlook with different username\pass (from Company A's domain).