windows phone logoConfirmed on the Windows Phone Blog by Terry Myerson, the new Mango build of Windows Phone OS has been Released to Manufacturing (RTM).

Earlier this morning, the Windows Phone development team officially signed off on the release to manufacturing (RTM) build of “Mango” – the latest version of the Windows Phone operating system. This marks the point in the development process where we hand code to our handset and mobile operator partners to optimize Mango for their specific phone and network configurations. Here on the Windows Phone team, we now turn to preparing for the update process. The Mango update for current Windows Phone handsets will be ready this fall, and of course will come pre-installed on new Windows Phones.

The keenly anticipated Mango update is scheduled to bring features like threaded conversations combining SMS, IM and Facebook chats, Twitter integration, improved Games Hub, multi-tasking and Internet Explorer 9. Its unclear at the moment if this earlier than expected RTM of Mango will mean an earlier launch of Mango toting handsets and OS updates to existing ones, or if this is actually on schedule and the manufacturers will now take 3 to 4 months to test and release.