Microsoft has extended the support for more than a year for Microsoft Security Essentials on the Windows XP operating system. Previously, they were shutting down the support when support for XP ends on April 8th, 2014. Now, the antimalware updates will end July 14, 2015.
This does not affect the end-of-support date of Windows XP, or the supportability of Windows XP for other Microsoft products, which deliver and apply those signatures.
For enterprise customers, this applies to System Center Endpoint Protection, Forefront Client Security, Forefront Endpoint Protection and Windows Intune running on Windows XP. For consumers, this applies to Microsoft Security Essentials.