Microsoft Security Essentials (Previously codenamed Morro) is a free antivirus software created by Microsoft that provides protection against viruses, spyware, rootkits, and trojans for Windows XP, Vista, and 7.
MSE replaces Windows Live OneCare — a subscription antivirus service — and Windows Defender, which only protects users from adware and spyware.
MSE is a small-footprint program ideal for computers that lack processing power or broadband Internet connections, such as netbooks.
It is geared for home use, unlike Microsoft’s upcoming enterprise-oriented product Microsoft Forefront.
Symantec and McAfee, two competing antivirus vendors, responded with criticism, claiming MSE was not comparable with their own offerings. AVG Technologies viewed MSE positively, stating it reinforced the company’s ideal of free antivirus software.
Reviews were mostly positive, citing its organized interface, low resource usage, and the fact it is free.
Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology. It’s easy to tell if your PC is secure — when you’re green, you’re good. It’s that simple.
Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want—without interruptions or long computer wait times.