Microsoft sets May 9 as original Windows 10's retirement date

Version 1507, the mid-2015 debut release, disappears from the patching list; next up, 1511, will likely follow in early October

As expected, Microsoft named May 9 as the date it will issue the final updates for the debut edition of Windows 10 that launched in 2015.

Two months ago, Microsoft had extended support for Windows 10 version 1507 -- Microsoft labels feature upgrades by year and month -- from March to May, but did not specify the date in the latter month. Computerworld anticipated May 9 as the end-of-support because that is the date for the month's Patch Tuesday.

The May 9 retirement was quietly announced on several support documents, including the "Windows lifecycle fact sheet," which lists several kinds of deadlines for various versions of the operating system.

Another document put it plainly. "The time has now come to end servicing for version 1507," the support document read.

Stopping support for Windows 10 editions -- Microsoft released the fourth on Tuesday -- is an important part of the company's software-as-a-service model. The company has pledged to support an individual edition, such as 1507, not for 10 years, as policy required for, say, Windows 7 or 8.1, but only for 18 months or so. That mandate insured Microsoft would not need to craft security patches, fix other bugs or add new features for an increasing number of versions.

By the time Windows 10 1507 slips off the list, it will have been supported for about 21 months. Part of the reason it lasted longer than Microsoft's stated norm was because the firm issued just one feature upgrade -- v. 1607 -- in 2016.

The next Windows 10 edition, v. 1511, could be purged from support as soon as early October. That's because Microsoft has committed to simultaneously supporting just two Current Branch for Business (CBB) builds. At the release of N+2 onto CBB, the company starts a 60-day-or-so countdown. At the end of the 60 days, N drops off the support list. N+1 then becomes N and N+2 morphs into N+1.

Under that policy, N would be 1511, N+1 version 1607 (released in August 2016) and N+2 1703 (this month's feature upgrade). Version 1703 will likely be promoted to the CBB in four months, or August; two months more would put 1511's support demise in October.

Users running 1507 must have upgraded to 1511, 1607 or 1703 by May 10 to receive future security patches, and other fixes or enhancements. Windows 10 1507 will not suddenly fail to boot, however, or degrade, as do copies that have not been activated with a product key.

The only exceptions will be customers whose devices are running v. 1507 from the Long-term Servicing Branch (LTSB), a special release track available only to organizations using Windows 10 Enterprise.

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