Mac Os 9.2 Outlook Express Randomly Quits

[venusvext]

Hi there,
When I check mail under one of my Outlook Express identities, the program unexpectedly quits on me. I thought that maybe it's caused by one of the emails in the Inbox but there is no pattern I can see except that it happens at least every 5-10 minutes. Tahnk you so much for your help!