While Diskeeper 2007 ended support for older Windows operating systems (Windows 98, ME, NT4), Diskeeper 10 is still available if you still use one of them. You can request this from your reseller of choice during your purchase (many still stock this version). I recently visited a large regional electronics franchise and saw a few boxes of Diskeeper 10 Professional available on their shelves. … If you are running Windows Vista Ultimate, Diskeeper 2007 Home edition will provide an update for this operating system shortly. The current Diskeeper 2007 Home edition for Vista does not support it, but if you purchase(d) Home edition you will, of course, receive the update free of charge. Diskeeper Professional and Pro Premier do currently support Windows Vista Ultimate.