Windows 10 Mobile has been available on new phones like the Microsoft Lumia 950 and Lumia 950 XL since November 2015, but the mobile operating system's roll out to older handsets has been repeatedly delayed.

The latest reports suggest that Windows 10 Mobile won't become available to Windows Phone 8 devices until the end of February. The roll out was previously supposed to begin in January, but for unknown reasons, it seems like Microsoft has delayed the update once again.

The news originates from French carrier Bouygues Telecom, who originally stated that Windows 10 Mobile would begin rolling out in the week of January 18th. Since then, the information provided to the carrier has changed, and although they're waiting for "more precise communication", they believe the update won't be available until late February.

This information also seems to gel with the latest information from Vodafone Australia, who say that they've finished testing Windows 10 Mobile and are only waiting on "confirmation of rollout schedule" before they proceed. It seems that the OS was originally going to be distributed this week, but Microsoft has now pushed the launch back, leaving carriers waiting for release approval.

For Windows Phone fans waiting patiently for a Windows 10 Mobile upgrade, this latest news will come as a disappointment. There is a chance that Microsoft is using the delay to polish the operating system for public release, but the company could also be waiting for MWC 2016, held in late February, to announce a roll out during their press conference.