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Outlook 365 will not open

After automatic update

July 14, 2020—KB4565483 (OS Builds 18362.959 and 18363.959) July 14, 2020-KB4565633 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1903 and Windows Server 1903 RTM and Windows 10, version 1909 and Windows Server, version 1909

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Answer

Hi KarlCaillouet,

This issue was posted to the Service Health Dashboard (SHD) as incident EX218604 Start time: July 16, 2020 12:18 AM. 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.

Tenant administrators can view current information and updates on SHD at the link here

For affected customers to easily identify the information here, this thread will be closed. We will update to the primary thread below once the issue is resolved or you can obtain the most recent information from SHD.
 
Your patience and cooperation are highly appreciated. 

Best regards, 
Joey
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Last updated October 5, 2023 Views 93 Applies to: