Neowin.net says it has procured the release schedule for Windows XP SP3:
- April 14, 2008: Support is available for the release version of Service Pack 3 for Windows XP
- April 21, 2008: Original Equipment Manufacturers, Volume License, Connect, and MSDN and TechNet subscribers
- April 29, 2008: Microsoft Update, Windows Update, Download Center
- June 10, 2008: Automatic Updates
