"It is recommended that all the users and organizations using Window XP OS in their environment should immediately plan for upgradation to the latest available OS according to their requirement and test software applications well before April, 2014," it said.

According to officials, the maximum of Indian computer and laptop users operate on Windows platform and after the recent declaration, users should keep themselves informed about the new and secure OS available in the market.

Microsoft had initially released Windows XP OS in August 2001. The current release version of Windows XP is called the Windows XP Service Pack 3.

Since then, three successor versions of client based OS namely Windows Vista in November 2006, Windows 7 in July 2009 and Windows 8 in August 2012 were released by Microsoft.

The latest client based OS available from the Microsoft stable is Windows 8.

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