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Windows Patch Notes

Windows Patch Notes / Tools

Calculate or check, on your device

Windows update evidence record

Organize your version, build, KB and symptom before checking an official release-health notice.

Processed in this browser, with no submission, storage or tracking.

Rule version: 2026-11-05.1 · Tool changed:

Inputs and checks

Inputs and checks

Input limits — Maximum characters: 80

Digits with an optional revision, for example 26100.1234. This format check does not confirm a real release. · Input limits — Maximum characters: 30

For example KB1234567. Leave blank if unknown. · Input limits — Maximum characters: 12

Keep recovery keys, account identifiers and private logs out of this record. · Input limits — Maximum characters: 500

Not calculated / checked

Result from your inputs

Enter your information, then choose Calculate / check.

Numbers display up to 6 decimal places. Nonzero values below 0.000001 use scientific notation. Calculations use the unrounded inputs.

Method and assumptions

  • The build and KB checks validate their written format only. They do not query Windows or Microsoft.
  • The record stays in this page; checklist marks are your statements, not verified observations.

What this tool can tell you

  • A completed checklist does not confirm that a particular update caused a symptom.
  • Use the actual affected-release notice before taking action; this tool changes no device settings.

Primary sources and rules

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