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.