Microsoft Security Essentials will be available in eight languages and 19 countries including Australia, Austria, Belgium, Brazil, Canada, France, Germany, Ireland, Israel, Italy, Japan, Mexico, the Netherlands, New Zealand, Singapore, Spain, Switzerland, the United Kingdom and the United States. Microsoft Security Essentials uses real-time protection to help prevent PCs from becoming infected, and it is the first Microsoft security product to make use of the company’s new Dynamic Signature Service, a technology that helps ensure users stay protected by the most current virus definitions available without having to wait for the next scheduled download. It also limits CPU and memory usage, resulting in less impact on the tasks consumers perform every day such as opening documents or browser windows or loading search results, even on older or less powerful PCs. According to Microsofts official 'end of support' site for Windows XP, it will no longer provide Microsoft Security Essentials for download on Windows XP. Microsoft Security Essentials is designed to run quietly in the background alerting users only when there is an action for them to take. but then MSE definition updates released sometime in early 2017 started to block both XP AND Vista users, even when Vista support was to end on April 2017. Microsoft's free anti-virus and malware protection software called Microsoft Security Essentials is now available for Windows XP, Vista and Windows 7.

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