Please forgive the stupid question but..
The requirements for BESExpress are:
Any of the following operating systems:
xxx8226; Windows Server® 2003 SP2 (32-bit or 64-bit)
xxx8226; Windows Server 2003 R2 SP2 (32-bit or 64-bit)
xxx8226; Windows Server 2008 SP2 (32-bit or 64-bit)
xxx8226; Windows® Small Business Server 2003
xxx8226; Windows Small Business Server 2008
Is Windows Server 2008 R2 (64-bit) that different from Windows Server 2008 SP2 (64-bit)? Isn't that the server "standard" now?