Businesses using Windows XP will need to upgrade to Service Pack 3 (SP3) of the operating system by July in order to continue receiving support from Microsoft.
Although XP is currently in its extended support phase, which runs until April 2014, users will need to be using a supported service pack to be eligible for this. The cutoff for XP SP2 support is 13 July 2010, while support for XP SP1 ended in October 2006. XP users will need to install SP3 through the Windows Update online service. Those not using XP SP2 will need to install this before downloading SP3.
Read more of "XP and Windows 2000: Time running out on support" at Silicon.com.