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Currently planning to migrate from Exchange 2003 to Exchange 2010.  We have a single email domain and 4 Active Directory domains.  With Exchange 2010 certificates, is the domain name to use for legacy servers the email domain or Active Directory domains?  Should it be legacy.emaildomain.com or 4 entries, legacy.activedirectorydoma<wbr />in1.com, legacy.activedirectorydoma<wbr />in2.com, etc?  Thanks.  
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Currently planning to migrate from Exchange 2003 to Exchange 2010.  We have a single email domain and 4 Active Directory domains.  With Exchange 2010 certificates, is the domain name to use for legacy servers the email domain or Active Directory domains?  Should it be legacy.emaildomain.com or 4 entries, legacy.activedirectorydomain1.com, legacy.activedirectorydomain2.com, etc?  Thanks.  

Exchange 2010 Certificates: Domain Name to Use for Legacy Servers?

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.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.