A survey by king research has shown that there is some pretty tight denial against Windows Vista in Business environments by IT administrators.
Some of the biggest marketing aspects of Vista are Direct X 10 and improved client security – two factors that are absolutely useless in a business environment. With the industry standards pointing toward open source technology and a very comprehensive use of Windows XP ( post SP2 release of course 😉 ) there is no real reason for any sane IT admin (hm ok that was a discrepancy there 😉 ) to currently migrate to the nextgen Windows.
Perhaps this is a good timing to migrate to open source software…
Neither or less you will have hell of a time with either Vista or OpenSource software migration so why not use something you can save licensing fees on and invest the savings into your employees or IT admin training.