Microsoft is expected to release the stable build 10586.164 of Windows 10 Mobile for Windows Phone 8.1 devices. The much awaited software upgrade is likely to begin this month.

According to Venture Beat that cites information that was received by its partners through an email, the Windows 10 Mobile update is expected to release in March 2016. Rumors suggest that the expected Windows Phone 8.1 devices will be receiving Windows 10 Mobile with build number 10586.164.

A user of the Lumia 520 on the Fast Ring of Windows Insiders has revealed that the OTA update notification of the newest build 10586.164 has an official information that states, “An important update is ready to be downloaded” along with some features of Windows 10 Mobile. Such a piece of information was not seen earlier, Windows Central reported.

The update will be coming first to smartphones that are already running on Windows 10 Mobile such as Lumia 950, Lumia 950 XL, Lumia 550 and Lumia 650. The build number 10586.14 is expected to be a final build of Windows 10. Before installing Windows 10 Mobile update on a Windows Phone 8.1 device, users will be required to install a firmware update.

Venture Beat has further stated that the Windows 10 Mobile update would be arriving passively to the users. It indicates that users will have to manually check for the arrival of the software upgrade on their devices. Later on, Microsoft will be rolling out the OTA to eligible Windows Phone 8.1 devices. The build 10586.164 is very stable and users of Windows Phone 8.1 devices will not major problems after upgrading to Windows 10 Mobile.

The arrival of Windows 10 Mobile update seems imminent as multiple sources are indicating its arrival in this month. Vodafone Australia has confirmed that the testing of the software upgrade has been completed and it waiting for official confirmation to release the update to Lumia 640, 640 XL, 735 and 930. Vodafone Italia’s forum site has stated that Lumia 535, 635, 830, 930 and 1020 will be receiving Windows 10 Mobile update in this week.