Use the System File Checker tool to repair missing or corrupted system ...
If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track.
Error codes in Device Manager in Windows - Microsoft Support
This article covers error codes that are generated by Device Manager in Windows. You probably reached this article because Device Manager or another tool like DXDiag reported an error code, and you are not sure how to resolve it.
Add or invite people outside your org to a chat in Microsoft Teams
With External Access for Teams, you can add or invite anyone outside of your Teams org who uses Teams, Teams for personal use, Skype (for consumers), and Skype for Business to a one-to-one chat. For those who use Teams or Teams for personal use, this includes both one-to-one chats and new or existing group chats.
Applies To: Microsoft Teams
Internet Explorer help - Microsoft Support
Seamlessly transition to Microsoft Edge by importing your favorites, preferences, and other browsing data from Internet Explorer. Get world-class performance, more privacy, and better productivity while you browse. Microsoft Edge is available on Windows, macOS, iOS, and Android.