I thought that I would give Wormguard and NAV2002 a workout by using the GFI Email Security Testing available here: http://www.gfi.com/emailsecuritytest/ This site provides several tests as follows: VBS attachment vulnerability test CLSID extension vulnerability test MIME header vulnerability test (Nimda testing) ActiveX vulnerability test (works only on IE5.5) GFI's Access exploit vulnerability test CLSID extension vulnerability test (for Outlook 2002) Malformed file extension vulnerability test (for Outlook 2002) Between them, Wormguard and NAV did an excellent job: however, the MIME test was a bit of a surprise (for me anyway). The test site indicates that the MIME exploit makes use of a malformed MIME header and an IFRAME tag to trick Outlook Express into running an attached VBS file. I was hoping that Wormguard would recognize the VBS attachment (as it did in the case of the VBS attachment vulnerability test); however, it did not do so. In truth, the MIME exploit with its attached VBS file did succeed when I chose to open the VBS attachment at the prompt. Anybody else try this? Outcome?