Here's a simple and interesting one. Two users, both Mac OS X 10.6, both accessing Exchange 2007 server. One sends another an attachment. The recipient receives the attachment as a WINMAIL.DAT file, as if it were coming from a Windows client like Outlook Express and from the early 2000's.
Thoughts on why this is happening? How to stop it?
If you are using Entourage, DO NOT install the latest Office update as it will cause crashing.