The official line from microsoft is Support for Windows XP is ending on April 8, 2014. If you’re running this version after support ends, you won’t get security updates for Windows. See http://windows.microsoft.com/en-AU/windows/end-support-help for more.
There will be no more security patches, bug fixes and free (or even paid) online assistance, as the firm ends its extended support for this operating system four years after it ceased offering mainstream support for the product. From April 8th next year, anyone who continues to use Windows XP will be at the mercy of hackers who find fresh ways to exploit vulnerabilities in the 12-year-old operating system and applications that run on it.
However this fact should be measured with fact that as of February 2013 Windows XP was still being used by 40% of all desktop users. See http://dig-it.com.au/blog/computer-repairs/windows-8-mark…re-none-really/ for complete statistics.
So it’s clear the need for XP is not going to go away in a hurry and in fact both the Australian Tax Office and the Commonwealth Bank still use XP however both have upcoming upgrades in progress.