Kurt Shintaku's Blog

Perhaps you have noticed when you install Windows Server 2008 and check the version level, you get this:

The answer is:  because the code trees have been merged – Vista SP1 and WS08.    This provides a single worldwide servicing tree, which is a good thing.

For the detailed, blow by blow account, see – http://blogs.msdn.com/iainmcdonald/archive/2008/02/15/windows-server-2008-is-called-sp1-adventures-in-doing-things-right.aspx