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Windows 10 Names, Builds and Versions

 ·  ☕ 3 min read

Update 2022-08-10

I’m will be no longer updating this page since Windows 11 has now been released and Microsoft have stated that Windows will return to a 2-3 year release schedule. Windows version information is available on Wikipedia also.

Update 2017-05-02

I’ll attempt to keep this up to date as new versions of Windows come out. This might seem like an odd topic to cover, but I’ve receive quite a few questions about this in recent months. Due to Windows 10 being developed constantly and on a rapid release schedule, it’s important to differentiate between the various major updates. Even though Windows 10 Anniversary Update (1607) seems very similar to what would have been called Windows 10 RTM in the past, there are some big changes, and keeping track of each major update can be tricky when traditionally IT Pro’s are used to a new version of Windows every few years rather than every few months. It also doesn’t help that each update has a marketing name that isn’t reflected anywhere in Windows itself, so matching the update names to version numbers/builds can be useful. Here’s a quick table on the major updates, their versions and actual build numbers.

Update Version Build Codename
Windows 10 RTM 1507 10240 Threshold 1
November Update 1511 10586 Threshold 2
Anniversary Update 1607 14393 Redstone 1
Creators Update 1703 15063 Redstone 2
Fall Creators Update 1709 16299 Redstone 3
April 2018 Update 1803 17134 Redstone 4
October 2018 Update 1809 17763 Redstone 5
May 2019 Update 1903 18362
November 2019 Update 1909 18363 19H2
May 2020 Update 2004 19041 20H1
October 2020 Update 20H2 19042 20H2
May 2021 Update 21H1 19043 21H1
October 2021 Update 21H2 19044 Sunvalley

As you can see from the table, there’s not a huge amount of updates currently (although certainly more than the traditional Windows release cycle) and it’s easier to think of each update as a service pack in some ways. If using Windows 10 LTSB 2015 (Long Term Servicing Branch) you will be on Windows 10 RTM (1507) and if you are using Windows 10 LTSB 2016, you will be on Windows 10 Anniversary Update (1607). The LTSB version of Windows 10 is only available to volume licensing customers and has some of the more consumer facing features and apps removed.

If you want to check what version of Windows 10 you’re using, just press the Start button and type winver and press Enter. If you have the Anniversary Update installed, Windows will report Version 1607 and OS Build 14393. The trailing 3 numbers in the image below are minor updates which are the regular updates you receive through Windows Update each month.

Winver Dialogue Window

The name of each update I tend to think as the friendly name or marketing name for it, as I’ve never actually seen the name referred to in the OS itself. For my own management of images and such, I tend to go by the version number. The version is easily remembered as it is derived from the year and month that the update was released, so 1607 is 2016, July, which is when the Anniversary Update was released.

If you have any questions or comments please leave them below.


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