For the past few weeks there was an Outlook 2007 that was crashing in the office on the file of wwlib.dll. No matter what I did to the system, repair Outlook, install SP1, no matter what the user would report that it crashed.
Today I said.. okay show me exactly what you are doing when it crashes. And I saw that the trigger was him trying to delete an email. A trade association email was causing the crash when he clicked on it.
To fix this I logged onto Outlook Web Access and deleted the email.
Voila. Fixed. No more crashing.