It most absolutely is a sign of Vista's instability. If you're Microsoft you want people to fork out their money and buy Vista. Period. It's fresh income and what good does it do you to continue providing support for an old piece of software where you can generate no more income? Continuing XP doesn't make economical sense to them, and this is all about money. When they say they are extending XP support, that means they are leaving some of their people to continue working on an old project. That wastes time, money, and as anyone can see or hear on the web today, completely undermines Vista. Paul Thurrott, THE Windows guy, even bashed Vista. He knows every last bit of info about every Microsoft OS out there to date. He even said "Since the euphoria of PDC 2003 [Microsoft Professional Developers Conference 2003], Microsoft's handling of Windows Vista has been abysmal. Promises have been made and dismissed, again and again. Features have come and gone. Heck, the entire project was literally restarted from scratch after it became obvious that the initial code base was a teetering, technological house of cards. Windows Vista, in other words, has been an utter disaster." The extension of XP is absolutely a sign that even Microsoft is acknowledging they have a failed product, not to mention the planned release of Microsoft Seven in 2010.