Microsoft earlier this month quietly extended the life of Windows 10’s debut edition, the version launched in July 2015.

Rather than end support for Windows 10 v. 1507—Microsoft labels the OS by year and month—in March, as announced last year, the company will issue the version’s final security updates in May, probably May 9, that month’s Patch Tuesday.

The new date was posted as a revision to a by Nathan Mercer, a senior product marketing manager for Microsoft. In the original entry, as the end of 1507 “servicing,” a company synonym for updating and patching.

In the amended post, Mercer did not give a reason for the extension.

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Microsoft timed the earlier end-of-support to exactly two months after the Jan. 26 release of media for N+2, where “N” equaled 1507 and “N+2” equaled 2016’s single upgrade. That version was marked as 1607 but is more commonly called the “Anniversary Update” because it appeared a year after the original.

After May, Microsoft will continue to provide updates and bug fixes only to Windows 10 1511 (a November 2015 version) and 1607. Users running 1507 must have upgraded to one of those versions (or to 1703, expected to ship next month) to receive security patches.

: “Think of the grace period as ‘at least’ 60 days.”

One hundred and three days, to be exact (using May 9 as the stop date).

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