Check this article from Business 2.0 magazine (http://money.cnn.com/2006/12/14/magazines/business2/microsoft_vista.biz2/index.htm?source=yahoo_quote):
Microsoft established product inter dependencies - Need SQL Server 2005 database management software to run many Microsoft products. But guess what: the new operating system Vista (went on sale to corporate customers on Nov 30th) - can't run the current version of SQL server. Microsoft is working on an upgrade but hasn't set a release date yet. Customers does have a choice: for example move to DB2
So the big question is: Is "eventually" good enough?