As we know, Microsoft will kill support for Windows XP on April 8, 2014. After this date, Windows XP will no longer be a supported operating system. But today Microsoft's Threat Research and Response Blog posted that "Microsoft will continue to provide updates to our antimalware signatures and engine for Windows XP users through July 14, 2015."
For consumers, "antimalware signatures" applies to Microsoft Security Essentials only but for enterprise customers, this applies to System Center Endpoint Protection, Forefront Client Security, Forefront Endpoint Protection and Windows Intune running on Windows XP.