Microsoft Lumia 950 and Lumia 950XL demonstrated the extensive capabilities of Windows 10 for Mobile during the #Windows10Devices launch event on Tuesday. Following the event, Lumia users stormed social media and Microsoft forums seeking information about when the new software would arrive on other older Lumia phones.

On Tuesday, Microsoft unveiled Lumia 950, Lumia 950XL, Lumia 550, Surface Pro 4 and Surface Book, all running Windows 10. But the main question remained unanswered - When will Microsoft rollout Windows 10 Mobile for its older Lumia phones? Luckily, we now have an answer to that.

Microsoft replied to its fans on the official Microsoft Lumia Facebook page that Windows 10 will start rolling out to Windows Phone devices in December. Unlike the desktop rollout, mobile version of Windows 10 will be a staged rollout and depend on the carriers to push the new software to eligible handsets.

Will your Lumia phone get Windows 10?

At this point, you may be wondering if your Windows Phone-powered smartphone is eligible for the upgrade. According to Microsoft, majority Lumia smartphones will be updated with Windows 10 Mobile. Devices running Windows Phone 8.1 and 8GB available internal space can get the upgrade for free. But the company notes that not all features of Windows 10 will be available as some features may require advanced and supported hardware.

Smartphones must run Lumia Denim (version 8.10.14219.341) or higher before upgrading to Windows 10 in December. To find out if your handset is up to date, go to Settings > About > More Information and check the OS version. Microsoft revealed that the first batch of Lumia smartphones to receive the Windows 10 update in December are Lumia 430, Lumia 435, Lumia 532, Lumia 535, Lumia 540, Lumia 635 (1 GB RAM), Lumia 640, Lumia 640 XL, Lumia 735, Lumia 830, and Lumia 930.

With Windows 10 for Mobile, Lumia phones can take advantage of Cortana integration, OneDrive, universal apps across different devices, new and updated Office and Outlook and more.

Windows 10 was originally launched on 29 July and has already been installed on more than 110 million devices worldwide. The free upgrade strategy certainly worked well in Microsoft's favor. But that's not the only reason for users to upgrade as the software giant packed several new features such as new Edge browser, Continuum, Windows Hello, redesigned UI, Cortana and lots more.