Windows 10 (original release)

Windows 10 (codenamed Threshold, also referred to as Windows 9 or Windows TH) is the successor to the Microsoft Windows 8.1 operating system released on 2015-07-29. It was believed to be called Windows 9, but this was revealed to be mistaken eventually, on 2014-09-30. Rumours have spread that 'Windows 9' was skipped because the name triggered code for Windows 9x in some applications, most of the time leading to an error message on the application not supporting Windows 9x. Windows 10 intends to address some of the complaints that were made in response to the user interface in Windows 8. Screenshots of Windows 10 build 9834 were released on 2014-09-11 which show a revised Start menu interface and additional improvements to the Windows operating system. Windows 10 is an revolutionary release, being the first to fully utilise the potential of Windows Update in order to provide features and fixes to the masses much faster, while also using foolhardy geeks as guinea pigs to provide rigorous testing. Windows 10 garnered largely positive reviews, and has easily exceeded the market share that Windows 8 gained in the same period.

Builds
'This list is not exhaustive, as there are thousands of buildtags collected and even more will be coming in the near future. Full log can be found on BuildFeed, our sister website.'

Please restrict editing this buildlist only to builds released to Partners or the Windows Insider Program.

Windows Update ESD Listing

 * See here for a list of Windows 10 ESD files that have been gathered from the Windows Update infrastructure. Please note that the list at the above link is not exhaustive; This is because such a list would be impractical to maintain, and also because internal Windows 10 ESD and flighting data can no longer be retrieved from Windows Update (as of 3-09-2015).

Pre-Technical Preview (Early Development)
A small number of builds from the pre-Technical Preview page are known. However, all but one of these supposed builds have been proven fake. The only legit pre-TP build was compiled just before the first Technical Preview, albeit in a different branch.

Technical Preview (6.4.9841-10.0.10061)
The Technical Preview was the first phase of the Windows Insider program. The first build released was 9841, and the last build released during the TP phase was build 10061.

Threshold Wave 1-class Insider Preview (10.0.10074-10.0.10166)
This phase of development began with build 10074, which was a quality build, at least going by the standards set by 10041/10049. The final phase of TH1 Insider Preview development ended with build 10166, which was extremely close to the RTM build, build 10240.

TH2 (Threshold Wave 2)
TH2 is the codename for the first post-RTM update to Windows 10. It is currently in the Insider Preview stage of development. It includes minor interface improvements to the shell, further evolution of the Edge browser and a slew of performance improvements and bugfixes, such as the new Memory Compression capabilities introduced in build 10525.

Redstone
Little is known about Redstone, a major update to Windows 10 due in 2016, except the codename (which, incidentally, is taken off Minecraft). No Redstone class builds have been released either to Insiders or the general public as yet. As of 2/09/2015, development is focused on Threshold Wave 2, which consists mainly of incremental improvements to the RTM build, so few, if any, Redstone-class builds have been compiled internally.