“This update to Microsoft Security Essentials is part of the standard product update release cycle. This service update contains product enhancements to improve performance and user experience. We have improved on Microsoft Security Essentials’ Automatic Remediation, which will automatically quarantine highly harmful threats without prompting the user to take action as well as minor bug fixes in set up, malware remediation and other areas.”

It was officially released on the 24th of April, and updates automatically through Windows Update. In Security Essentials 4.0, the options to configure to scan all downloads, monitor only incoming or outgoing files, enable or disable behavior monitoring or network inspection system have been deleted.