I have been having the same issue for a while and there are multiple
discussions about this issue on the web. Here is what the Entrouage Error
Report offers and usually happens when you are moving down the list and/or
deleting emails:
Microsoft Error Reporting log version: 2.0
Error Signature:
Exception: EXC_BAD_ACCESS
Date/Time: 2009-07-21 10:14:57 -0400
Application Name: Microsoft Entourage
Application Bundle ID: com.microsoft.Entourage
Application Signature: OPIM
Application Version: 12.2.0.090605
Crashed Module Name: JavaScriptCore
Crashed Module Version: unknown
Crashed Module Offset: 0x000045bc
Blame Module Name: JavaScriptCore
Blame Module Version: unknown
Blame Module Offset: 0x000045bc
Application LCID: 1033
Extra app info: Reg=en Loc=0x0409
A solution that was offered by downloading and executing MAC Update Combo
10.5.7; which did not work for me. Also, just loaded the recent upgrade from
Microsoft that supposedly improved the stability. The treads show that the
problem could be Safari 4.0+ in conjunction with Entourage 2008. However,
there is not an easy way to remove Safari and when I did, other issues
started on my Firefox browser when trying to use WebEx.
I was hoping that by sending the log to Microsoft every time Entourage
crashed may result in a response. So far, a month into it and 3-4 crashes a
day, and no response!