As the dust settles following Microsoft’s big devices event in New York this week, in which we heard about Microsoft’s first Windows 10 phones the Lumia 950, Lumia 950XL and the cheaper Lumia 550, we now have news about when Windows 10 will be coming to other, existing Windows Phones.

Thanks to a question raised on Microsoft Lumia’s Facebook page concerning when Windows 10 will be available for “phones like Lumia 640,640xl,” we know that December will be the month the new OS will roll-out for such existing mobile devices.

“…broad availability of Windows 10 on other devices, including mobile phones, will begin rolling out in December,” was the exact answer, while in a following post Microsoft expanded on that, explaining, “We’ve recently announced that the next generation of Windows will be available later this year and it is our ambition to make an upgrade available for majority of Lumia smartphones running Windows Phone 8.1. 8 GB of internal memory required.”

It should also be noted that some devices will not support features such as Windows Hello and Continuum, without new hardware anyway.

According to reports this will start with select devices, though which devices will probably remain a mystery for some time. Given the aforementioned condition it will of course mean some entry level phones won’t be getting the upgrade.

Microsoft has said it wants Windows 10 running on one billion devices in just three years, and there is still a fair way to go considering that it was announced at the event that the OS had just broken 110 million devices. Speaking at the event Panos Panay, Microsoft’s devices chief, said, “We want to put Windows in your pocket,” and when that happens Microsoft will be much closer to reaching its one billion goal. For just one month, given that the new Windows 10 Lumia phones will ship in November, those pockets can only be filled by three phones.

Photo credit: Microsoft