On the event of the 6th October Microsoft reveled that the there are 110 million devices running with Windows 10. In same event they also launch many devices. The devices include Surface Pro 4, Surface Book, HoloLense, Microsoft Band 2, Lumia 950, Lumia 950 XL, Lumia 550 and also Xbox with windows 10. You can still watch the whole event’s video on demand on the Microsoft website.
However during the whole event they didn’t announced the Windows 10 for mobile devices. They just announced that Lumia 950, Lumia 950 XL and Lumia 550 will available with inbuilt windows 10. But the US firm hinted at the release date in the comments section on the official Lumia Facebook page. Unfortunately the company has not confirmed the exact UK release date as this will depend of mobile carriers to push-out the major operating system update. As for compatibility, Microsoft only says “it is our ambition” that the “majority of Lumia smartphones” will get Windows 10.
The Official Microsoft Lumia Page on Facebook responding to a fan question
on the Microsoft’s spokesperson stated that “broad availability of Windows 10 on other devices, including mobile phones, will begin rolling out in December.”
Microsoft earlier reveled that the Windows 10 available for all Lumia devices but they also added that update would require a minimum of 8 GB of on board storage, which does rule out some lower-end models. which rules out Lumia 530 owners. Only smartphones currently Lumia Denim are able to upgrade, according to the Microsoft support page