I noticed a couple of things about windows: users inside the company compulsively send attachments to the point where people open them without thinking. Outlook adds external users to its address book, then hides domain name information when it displays that user. It can be hard to tell what is internal mail and what is not.
Sad, isnt it?
I wonder where this fetish for Outlook come from.
I call it OutOfLuck, because you really are.
It is one of the things that make stupid users more stupid...