Microsoft plans to start selling its Windows 7 add-on support beginning April 1.

Labeled "Extended Security Updates" (ESU), the post-retirement support will give enterprise customers more time to purge their environments of Windows 7. From Windows 7's Jan. 14, 2020 end of support, ESU will provide security fixes for uncovered or reported vulnerabilities in the OS.

[ Related: Windows 7 to Windows 10 migration guide ]

Patches will be issued only for bugs rated "Critical" or "Important" by Microsoft, the top two rankings in a four-step scoring system.

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