Microsoft may be sunsetting XP, but you'll still be able to buy it on some new systems--and support isn't going away for several  Microsoft's public statement seems to leave no wiggle room. It reads, "Windows XP will no longer be available for purchase from Microsoft for general retail and OEM partners as of June 30, 2008." But that simple statement hides plenty of loopholes. First, retailers and PC makers can still sell the Windows XP software, and Windows XP PCs, after that date, as long as they purchased the products before June 30. If a retailer stocked up on copies of XP before June 30, it can sell XP for as long as those supplies hold out. The same holds true for PC manufacturers. An even bigger loophole--something called downgrade rights--will allow people to get Windows XP on new PCs, even after computer makers' stock of Windows XP licenses runs out. An OEM such as Dell can sell you a PC that starts out with Vista Business or Vista Ultimate on it, and then downgrade the operating system to Windows XP Professional before shipping the machine out to you. In the box, you will receive discs for Vista, XP, Vista drivers, and XP drivers. That way, if you decide you'd prefer Vista, you can use the installation disc and drivers to upgrade to that OS.

You can do this only with Vista PCs for which the OEM has decided to offer downgrade rights, however. A Dell spokesperson says that Dell will provide the option for its XPS line of gaming PCs (the XPS M1730 laptop, XPS 630 gaming desktop, and XPS 730 gaming desktop), for its line of Vostro small-business PCs, and for enterprise customers. Dell won't offer the choice indefinitely, though--only through January 31, 2009. HP also offers a downgrade option on its business desktops, notebooks, and workstations, and will continue to do so until at least July 30, 2009, says a company spokesperson. As with Dell PCs, when someone buys a system, it will have XP Pro installed, and will come with discs for both XP and Vista.