While basic definition updates continued for some time, Microsoft has largely ceased updating MSE. As of early 2025, many users have reported that the software can no longer connect to servers to receive new security signatures.
Microsoft Security Essentials reached its end of service on January 14, 2020 . It was designed for Windows 7 and Vista, which are also no longer supported. While basic definition updates continued for some time,
New installations are no longer officially available from Microsoft. While basic definition updates continued for some time,