Since Windows 10 is updated on a regular basis there are a few different official release versions that are available based on the servicing options it is covered under.
You might have heard about some of these servicing options already with names like Current Branch (CB), Current Branch for Business (CBB) and the Long-Term Servicing Branch (LTSB).
You can learn more about those servicing options over on TechNet.
This Windows 10 release information resource from Microsoft will give you the exact information you need about the branch/version of Windows you should be on based on those servicing options.
Over time, as new major updates are released by Microsoft for Windows 10, the recommendations for what builds will be under each servicing option will adjust and this chart will be updated.
Another area on this Windows 10 release information page that you will want to keep an eye on is the Windows 10 update history broken down by major OS updates.
Currently Version 1507 (OS Build 10240) and Version 1511 (OS Build 10586) are listed there along with all live links to the cumulative updates that have been released for those builds.
As a refresher Version 1507 was the initial Windows 10 release last July (15 - year; 07 - month) and Version 1511 was the November Update (15 - year; 11 - month) which was the first major update released for Windows 10.
This summer, when the Windows 10 Anniversary Update is released, that will take Windows 10 to Version 1607 and the OS Build will be based on wherever the Windows team is in the development branch of Redstone 1 (the code name for the Anniversary Update).
At that time you can expect this chart to be updated with new recommendations for LTSB, CBB and CB for Windows 10 and decide what will be the most stable build for your users.
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