So why would Microsoft release such a tool for free? At this point, Antivirus solutions are a commodity – there are several dozen antivirus application vendors out there and not much to differentiate between the basic need to scan, update, detect and remove malicious software. For this reason, antivirus vendors have started to add on extra complementary features.
Microsoft’s stance is that quality antivirus software should be available free of charge to all computer users. I don’t think it’s a completely altruistic deed – I have a feeling Microsoft’s Live OneCare got lost in the shuffle of all the competing products out there. If you think about it, it’s in Microsoft’s best interest to keep computers protected from viruses and other malicious software – since LiveOnecare didn’t take off and Defender only did half of the protection, Microsoft thought it best to combine the products and release it for free.
Security Essentials covers the essentials, and it is definitely a step up from the basic Windows Defender, but again, you aren’t going to find all the bells and whistles needed for advanced computer protection (firewall, web filtering, etc.), nor are you going to find business related features such as centralized administration, deployment and management. It’s called Microsoft Security Essentials for a reason.