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Microsoft Windows 10 Preview builds expiration dates are out


Windows insiders running older builds, might have noticed random restarts occurring, but these are not bugs. The planned restarts are actual warnings, prompting to update Windows 10 to the latest build, and to prevent reports on bugs that have already been fixed in current builds.

Microsoft Windows 10 update cycle

The restarts, however, will not go on indefinitely, and a schedule has been issued, listing Windows 10 build numbers which will no longer able to boot as soon as they expire.

The measure has been taken due to the particularly long development period of the operating system, which, by the time it reaches its commercial availability, will have gone through over one year of testing.


Build number  | Expiration warnings begin  | License expiration date  | Windows will stop booting 
9841 4/2/15 4/15/15 4/30/15
9860 4/2/15 4/15/15 4/30/15
9879 4/2/15 4/15/15 4/30/15
9926 9/17/15 10/1/15 10/15/15
10041 9/17/15 10/1/15 10/15/15
10049 9/17/15 10/1/15 10/15/15


The latest build, currently 10049, will begin to issue warnings in mid-september, within two weeks from the expiration of its license. In mid-October, PCs running build 10049 will stop booting up.

According to this information, we could estimate there will be at least one more build issued before Windows 10’s official release, which, with any luck, will happen in June.

What happens to Windows 10 Preview, when Windows 10 is commercially available?

Insiders have been asking this question for sometime. It is has been postulated by some, that Windows 10 will simply receive one final update, offering an option to register using the previous key from a valid license of Windows 7 or 8.1. According to a thread published on Microsoft Community, on April 10, there is some indication that the above assumptions may be correct.


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