Windows 10: A guide to the updates


In mid-October, Microsoft announced the availability of Windows 10 version 20H2, known as the October 2020 Update. But the launch of a major Windows 10 update isn’t the end of a process — it’s really just the beginning. As soon as one of Microsoft’s twice-yearly feature updates is released, the company quickly gets to work on improving it by fixing bugs, releasing security patches, and occasionally adding new features.

Here we’ve summarized what you need to know about each update released to the public for the most recent versions of Windows 10; currently that’s version 20H2 and version 2004 (also known as the May 2020 Update). These two versions are similar enough that Microsoft is releasing their updates together.

For each build, we’ve included the date of its initial release and a link to Microsoft’s announcement about it. The most recent updates appear first.

If you’re still using an earlier version of Windows 10 or of Windows, see the Microsoft support site for info about updates to Windows 10 version 1909, Windows 10 version 1903, Windows 10 version 1809, Windows 10 version 1803, Windows 10 version 1709, Windows 10 version 1703, Windows 10 version 1607, Windows 10 version 1511, the initial version of Windows 10 released in July 2015, Windows 8.1, and Windows 7.

And if you’re looking for information about Insider Program previews for upcoming feature releases of Windows 10, see “Windows 10 Insider Previews: A guide to the builds.”

Updates to Windows 10 versions 2004 and 20H2 (May 2020 Update and October 2020 Update)

KB5001391 (OS Builds 19041.964 and 19042.964) Preview

Release date: April 28, 2021



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