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We are merging with another company. &nbsp;The big question is, can we keep our AD environments separated (but with trusts), yet use 1 of the existing exchange environmnets. &nbsp;<br />
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Company A = ham.com<br />
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Company B = cheese.com<br />
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Cheese.com is going away. &nbsp;All employees of the combined company will get mail from ham.com. &nbsp;Can company B use company A's exchange server without doing a domian migration (just trust the forrests). &nbsp;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).
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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).

2 forrests 1 exchange with single sign on

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.