If you are confused by the naming of ClamAV products, here's a quick breakdown:

• ClamAV^®: open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. Available here.
  
• ClamAV^® (Win32 binaries): Win32 port of ClamAV. Available here.
  
• ClamAV^® for Windows: Microsoft^® Windows-specific Anti-Virus (AV) solution using an advanced Cloud-based protection mechanism. Developed in partnership with Immunet Corporation. Available here.
  The products listed above are the only ones developed and maintained by Sourcefire^® Inc.