Windows 32bit Family XP RTM - 5.1.2600
XP SP1a - 1106
XP SP2 - 2180
Server 2003 RTM - 5.2.3790
Server 2003 SP1 - 1830
Server 2003 SP2 - 3959
Vista RTM - 6000.16386
Server 2008 Beta 3 - 6001.16510
Windows 64bit Family XP 64bit RTM - 5.2.3790.1830
XP 64bit SP2 - 3959
Server 2003 64bit RTM - 5.2.3790.1830
Server 2003 64bit SP2 - 3959
Vista 64bit RTM - 6000.16386
Server 2008 64bit Beta 3 - 6001.16510
Microsoft Update Team: Windows XP Service Pack 3 (SP3) is now available on Windows Update (and the Microsoft Download Center)!
If you'd like to install it via WU today, you'll need to visit the Windows Update website. To do this, go to Windows Update and perform an express or custom install, make sure you see the service pack selected, and proceed with the install. After it downloads, you'll see a series of screens and you'll be asked to make a few clicks before the install will begin.
If you're not in a rush, we recommend you use Automatic Updates to install Windows XP SP3. It provides the best experience because the download will happen in the background. We're planning to begin automatically distributing Windows XP SP3 over AU sometime in the next few months.