Anyone know how this works:

Are you still running Wiindows 2000, NT 4.0 or 98SE operating system in your office and need more PC's with the same? Unfortunately, you won't find any new PC's with these operating systems—Microsoft stopped installing these OS's last summer. Don't worry--we have an even better solution for you. A new PC installed with Microsoft Windows XP Professional will let you "downgrade" to one of these previous OS versions so your office can continue to run on the same Win 2000, NT 4.0 or 98SE operating system. Later, when you decide you want to run Windows XP Pro, just reinstall it. This is all FREE when you buy a new PC with Windows XP Pro preinstalled. Microsoft calls this "Downgrade Rights" and you'll automatically have them with a new Systemax PC installed with Windows XP Pro.