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Microsoft has announced the Windows XP end of support date of April 8, 2014. After this date, Windows XP will no longer be a supported operating system*. To help organizations complete their migrations, Microsoft will continue to provide updates to our antimalware signatures and engine for Windows XP users through 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.
Our research shows that the effectiveness of antimalware solutions on out-of-support operating systems is limited. Running a well-protected solution starts with using modern software and hardware designed to help protect against today’s threat landscape.
Microsoft recommends best practices to protect your PC such as:
Our goal is to provide great antimalware solutions for our consumer and business customers. We will continue to work with our customers and partners in doing so, and help our customers complete their migrations as Windows XP end of life approaches.
* We've received some inquiries about what "no longer supported operating system" means. To clarify, this mean that, after April 8, 2014, Windows XP users will no longer receive new security updates, non-security hotfixes, free or paid assisted support options, or online technical content updates from Microsoft.
February 5, 2014: We’ve received several inquiries about the difference between security updates and antimalware signatures, as well as the Malicious Software Removal Tool (MSRT) for Windows XP. You can find answers to these questions and more on our Windows XP end of support page.