Microsoft has pushed back the introduction of Windows XP Service Pack 3 to the first half of 2008.
The next big upgrade to Windows XP had been expected in the second half of next year, but delays in the introduction of Windows Vista are believed to have had an impact on the Windows XP upgrade.
The last big upgrade to Windows XP, which majored on significant security upgrades, was Service Pack 2 which was first introduced over two years ago, in August 2004.
As Microsoft normally staggers the introduction of major updates via its automatic updating services, many XP users may not see their OS updated until the second half of 2008, unless they manually load it themselves.
Windows Vista is expected to be introduced to large businesses next month, with a general launch expected in January next year.