[German]Update KB5003169 dated May 11, 2021 for Windows 10 version 1909 probably causes collateral damage. After installation, logging into Microsoft 365 desktop client apps such as Microsoft Teams, OneDrive for Business, and Microsoft Outlook may fail. You may see error message 80080300 or "We ran into a problem. Reconnecting…" when authenticating or logging into Teams. In the KB article for the update, Microsoft recommends restarting or using the web apps for the Office module in question. (via)
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