Neowin has posted what they say is Microsoft's "internal schedule" for the release of Windows XP Service Pack 3. I have no information with regards to these dates, but the maturity of recent pre-release builds of the software had suggested to me that an April 2008 release was likely, and that seems to be the case:

  • 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