I think its a Microsfoft problem. I had a problem with OE crashes on my machine at work. For me, there seemed to be a conflict between OE and Office 98. On that computer, any Office 98 application--but only Office 98 applications--precipitated the crash.
Open Outlook Express.
Open Word 98 or Excel 98.
See computer crash.
Crash, computer crash.
I presume that the cause is a library conflict. Standard MacOS 9/8/7 applications use the newest version of duplicate libraries. However, there is nothing standard about Microsoft.