Vista "upgrade" drops compliance checking, requires old OS to install

arstechnica.com — Microsoft's quest to closely control the way Windows Vista can be used on PCs has taken a turn for the worse, as new information indicates that the company is breaking tradition when it comes to Windows Vista upgrades. With Windows Vista, users will not be able to use upgrade keys to initiate completely new installations. Jan 28, 2007 View in Crawl 4