Hi Sathish,
MS Update (
http://update.microsoft.com) does support both Windows and Office update services that can be setup to do automatic
notification and or installation of updates for Office XP and Office 2003.
You can also signup for the Office email newsletter from Microsoft to be notified when Office updates are released, although it
doesn't come out often.
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How to configure Windows update ot Microsoft update to get Update and patches
for Office products. >>
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Let us know if this helped you,
Bob Buckland ?
MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
For Everyday MS Office tips to "use right away" -
http://microsoft.com/events/series/administrativetipsandtricks.mspx