The surprising part is that this is not just one server running a bunch of software, it is "an integrated server infrastructure solution."
Windows EBS Standard consist of three servers:
Management Server (Windows Server 2008 with Active Directory Services and Systems Center Essentials)
Messaging Server (Active Directory Services, Exchange Server 2007, and Forefront Security for Exchange)
Security Server (Exchange Server 2007 and ISA Server vNext).
Windows EBS Premium adds a Database server running SQL Server 2008.
This is a big departure from the "cram it in one box" approach of Windows Small Business Server 2003, but it’s definitely a more serious approach to a Windows Server Infrastruction.
Additionally, I wouldn’t be surprised if this infrastructure eventually lends itself to virtualization. That would be a bit tough for now, because the Windows EBS infrastructure requires 64-bit operating systems, and Virtual Server 2005 R2 only supports 32-bit guest operating systems. But it won’t be long before it’s a real possibility.
What I’m really excited about is Windows codename "Cougar," a.k.a. Windows Small Business Server 2008. More on that to come…