ClamWin Free Antivirus comes with an easy installer and open source code at no cost. It features:
* Scanning Scheduler;
* Automatic Virus Database Updates. ClamAV team updates Virus Databases on a regular basis and almost immediately after a new virus/variant is out;
* Standalone Virus Scanner;
* Context Menu Integration to Microsoft Windows Explorer;
* Addin to Microsoft Outlook.
Support for other email clients using POP3 Proxy is coming in the next release (0.40). Please watch this space for further announcements.