How to find relevant KB (Knowledgebase) information within Windows Update.
Go to Windows Update
Search -> Windows Update:
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Look and click on for "View installed updates":
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Click on the installed update for additional information from the Microsoft Knowledgebase
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The result should open your browser (example):
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To access the Microsoft Knowledgebase outside of this, find the KB number for your update and go to:
Microsoft Support
Some early Windows Updates for Windows 10 may not contain detailed KB information. There was criticism about this and it has been corrected, for the most part.