[Spambayes] Outlook plugin and Exchange Server anti-virus

[Chuck Renner]

> Something about this doesn't quite add up. If you're running 
> NAV on the server, it's hard to see how Spambayes gets its 
> hands on the message before NAV is done with it. Is it 
> possible that instead (or in addition) you're running NAV's 
> "MS Exchange Realtime Protection" on the client? If so, you 
> may be duplicating work that the server has already done. In 
> that scenario, it's the client version of NAV, not the server 
> version, that's jockeying with Spambayes for custody of the 
> message. In which case simply turning off the NAV scan on the 
> client may solve the problem.

Update: after disabling NAV on the client, I still get the same problem.
NAV on the server merely flags the file without being able to quarantine
it.