Uhh, with some new worms, you not only can't execute the rogue directly by just clicking on an attachment, but you need to enter a password to get access to it... you just need a userbase clueless enough to carry out even a fairly complicated action out of curiosity, and some social engineering.
That's certainly true, though you can minimise such issues in KDE by using Kiosk mode to reduce the functionality available to users. I was responding however to Kenneth's point about how easy it was to open an attachment in it's respective app.
I don't minimise the dangers - they are real, but I do think we're in a better poisiton in the unix desktop world than the current state of the windows desktop.
Cheers
Rich.