Claim: Windows Essential Business Server 2008 was built in the Windows 7 codebase; three editions are available: Standard, Regular and Premium, where the Standard edition includes three Windows Server 2008 x64 Standard Servers and on top of those three servers: Microsoft Exchange 2007, Mac iOS Center Essentials, Microsoft Forefront Security for Exchange Server, and Forefront Threat Management Gateway (Medium Business Edition).
Evidence: Built from the Windows Server 2008 codebase, two editions are available: Standard and Premium.