This antivirus and anti-spyware program uses the same tried and tested scanning engine and signature updates as Windows OneCare (which goes away once MSE is out) and the ForeFront Client Security (Microsoft's business focused AV solution). It is available in 32bit and 64bit versions and has been optimized to provide a small system overhead and minimal user interface. This is in stark contrast to the bloated AV products available today from many of the main AV vendors.
Although this tool is intended as a consumer product it is difficult not to consider this in the SMB space as well, in the same way Windows Defender has become a standard part of most small business installations.
Those of you old enough, may well be asking yourself if this is going to be any different from the MS-AV farce in the days of MS-DOS 5.0 and Windows 3.1? Well we at CM have been testing this application for a few weeks now and we have found it to be excellent! The UI may be minimal but don't think for one minute that this product has cut back where it matters, its ability to detect and protect your system from malware attacks is top class. Check it out here: http://www.microsoft.com/security_essentials/
So tell you family and friends! Good, simple, solid AV protection is, at last, available for free!