Active Investigation into Outlook Crashing on Launch
There is a new symptom of Outlook is crashing on launch starting 7/15. 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 for an hour then try again.
If this issue persists beyond four hours please contact Microsoft Support by whichever means works best for you.
You may see an error such as:
"Outlook couldn't start last time. Safe mode could help you troubleshoot the problem, but some features might not be available in this mode.
Do you want to start in Safe Mode?"
In the event viewer you will see a crash event like:
Faulting application name: OUTLOOK.EXE, version: 16.0.13102.20002, time stamp: 0x5efe7a9e
Faulting module name: OUTLOOK.EXE, version: 16.0.13102.20002, time stamp: 0x5efe7a9e
Microsoft suggests users use web and mobile clients until the issue is resolved.
Title: Users experiencing Outlook connection issues and crashes
User Impact: Users may experience crashes or may be unable to access Exchange Online via Outlook.
More info: Our analysis indicates that Outlook on the web and mobile clients are unaffected. Users may be able to leverage those protocols as an alternative means to access email and service features while we remediate this problem.
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.
Scope of impact: This issue may potentially affect any of your users attempting to use Outlook.
you could try
Open cmd, run:
cd "\Program Files\Common Files\microsoft
officec2rclient.exe /update user