Microsoft's Security Essentials is not free for commercial use.
So I remain bullish on Security Essentials, to answer also David's question.
But just tell Microsoft you want Security Essentials.
Microsoft has today both announced and released a beta version of its free Security Essentials anti-malware software.
Security Essentials works great and it does not become annoying like some suites.
And I run an automatic full scan with Security Essentials every night.
It came first, as we remember, Security Essentials came later.
This network-based monitoring represents a significant broadening of the Security Essentials' scope.
Windows 7 is great, and you can get comprehensive security for free using Security Essentials.
If only MS was allowed to bundle Security Essentials with windows.