Microsoft's new major update for Windows Phone mobile operating system has been confirmed for release next month.

Following the announcement at its Build Developer Conference earlier in April, Microsoft released the Windows Phone 8.1 Developer Preview version in the middle of the same month. The Developer Preview version has received a few updates with bug fixes and other improvements.

There have been several reports suggesting the official roll out of Windows Phone 8.1 although there was no official word on the same. Now a tweet from Microsoft India confirms the official availability of Windows Phone 8.1.

Microsoft will release Windows Phone 8.1 update to the existing Windows Phone 8 users during the first two weeks of July. It is unclear if the July release is for India only but this does hint the global roll out. Note that the release and availability of the update depends on the market and carrier networks.

This confirmation goes well with the previous roadmap leak, which suggests the Windows Phone 8.1 update schedule for Nokia's Lumia branded handsets such as Lumia 920, Lumia 820, Lumia 620, Lumia 520, Lumia 720, Lumia 925, Lumia 1020, Lumia 625, Lumia 1520 and Lumia 1320. The update is expected to be released in July and continue in August.