Microsoft had previously promised to deliver its Windows 10 Mobile update to existing Lumia devices this month, but the company is delaying its roll out. In a statement, Microsoft says the Windows 10 Mobile upgrade will now begin early next year to select devices running Windows Phone 8 and 8.1:

"This November we introduced Windows 10 to phones including brand new features such as Continuum and Universal Windows Apps with the introduction of the Lumia 950 and 950 XL. The Windows 10 Mobile upgrade will begin rolling out early next year to select existing Windows 8 and 8.1 phones."

Microsoft still isn't confirming which devices will get the upgrade, but the company previously said "it is our ambition" that the "majority of Lumia smartphones" get the update. Devices will require 8GB of storage, so that means some handsets like the Lumia 530 will be left out. Microsoft released the final version of Windows 10 Mobile alongside its Lumia 950 and Lumia 950 XL launch earlier this month. The software maker now plans to regularly update the operating system, alongside the PC version of Windows 10.