OUTLOOK VBA Crash Certificate

I had the exact same problem in Outlook.

It seems to occur if you had something that is previously signed in a earlier version of Outlook for the bit.

Here are the procedure I used to fix it:

• Back to all your code/projects etc.
• Close Outlook.
• Search for VbaProject.OTM (or whatever file was used to store your projects, there could be more than one)
  For me it is in [Drive]:\users\[username]\appdata\roaming\microsoft\outlook
• Move this file to the another location.
• Open Outlook.
• Go to VBA and recreate your projects from your backups.
• You should now is able to bring up the digital signature option without it crashing.

Hope that helps.

OUTLOOK VBA Crash Certificate