Many of our customers have been experiencing some of their users having Outlook crashing immediately after opening. We even had other tech companies call to find out how we were fixing it, so we investigated and found the following known issue from Microsoft:
Users experiencing Outlook connection issues and crashes
EX218604, Exchange Online, Last updated: July 15, 2020 10:12 AM
Start time: July 15, 2020 9:18 AM
User impact:
Users may experience crashes or may be unable to access Exchange Online via Outlook.
Current status:
Our initial review of the available data indicates that recently deployed updates are the likely source of the problem. We’re performing an analysis of all recent service updates to isolate the underlying cause of the problem and to determine the most expedient means to restore service.
We will be keeping our monthly clients up to date on this issue.
Looks like Microsoft has sent out a fix for the issue.
Users experiencing Outlook connection issues and crashes
EX218604, Exchange Online, Last updated: July 15, 2020 2:29 PM
Start time: July 15, 2020 9:18 AM
User impact:
Users may experience crashes or may be unable to access Exchange Online via Outlook.
Current status:
A fix has been published but will take time to propagate to worldwide availability. Outlook will automatically look for the fix on launch, so if this issue persists through multiple launches please use Outlook Web Access (or your providers webmail interface) for an hour then try again.