Jim,
Point well taken!! I am having trouble just mentioning MS on this, since a lot of vendors are tightening security around email (GMail doesn't even let you send ZIP files, for example). Other vendors put such a tight security policy in their email servers that it just 'deletes' emails that are suspicious independently of the end-user. I have encountered this issue with email servers that do not even notify the sender that a 'bounce' has taken place (UNIX/LINUX/MS... regardless of platform). And Act has fits over PDF files, not to meintion its love to unsiggned MS Office documents (those are the ones that will kill you with malicious code/worms/virii). Also, those self-appointed sites that most email servers access to check the validity of a domain (I can basically put an anonymous complaint in a couple of those that will cause a domain or outgoing mail server IP to be blacklisted automatically on may big email gateway, such as AOL, timewarner, 1and1, etc.) http://ordb.org/lookup/ or http://www.spamcop.net/bl.shtml for example - they also work off IP addresses instead of domains.

The whole situation is very sad, specially when end-users TAKE NO RESPONSIBILITY FOR THEIR OWN DESTRUCTIVE IGNORANCE AND ASSUME THAT THEY ARE SAFE - that is why we have 'defensive driving' classes. On the other hand, is more revenue for me.

I happen to support close to 1200 PCs accross organizations and individuals, and I rather take 2 minutes explaining how to fix this issue with Outlook (yeah, like Eudora doesn't have the same issue) than cleaning a virus or spyware infection accross multiple computers.

What we need to address is safe computing practices in general reagrdless of platform.