Exchange Server Toolbox
Question / Problem
How can I update ClamAV myself?
Answer / Solution
You may update the dlls and exe files (C:\Programs\Common Files\JAM Software\ClamAV) of ClamAV your self by getting them from the ClamWin (http://www.clamwin.com/ ) project. But we do not give any support for this. It may cause no virus to be detected or any mail/file be detected as virus. We once had this situation when ClamWin changed some interfaces which did not result in error, just in such a strange behavior.
Hint: The virus signature files used by ClamAV are updated automatically at least every 3 hours.