Microsoft has confirmed plans to launch the latest version of its mobile operating system known as Windows Phone 7 in New York on October 11. Details about the unveiling are still a little sparse, but the invite makes it clear that Microsoft CEO Steve Ballmer will be joined by AT&T's Ralph de la Vega for a morning keynote. T-Mobile is also expected to offer Windows Phone 7 handsets, though it's unclear if the carrier will be a part of this launch event.

Windows Phone 7 is Microsoft's latest attempt to regain lost ground in the mobile phone sector. Over the past few years, Microsoft's mobile platforms have lost ground to Apple's iPhone, RIM's BlackBerry, and Google's Android platforms. Windows Phone 7 replaces the Windows-like, multi-level menu system with touch-friendly tiles and hubs. The interface reportedly borrows from Microsoft's ZuneHD music player interface.

To date, LG, Samsung, Dell, Asus and HTC have been confirmed as hardware partners for Windows Phone 7 devices, although we don't yet know when each of these companies will launch Windows Phone 7 handsets.

Windows Phone 7 is expected to be available for GSM networks (aka T-Mobile and AT&T in the U.S.) first. Verizon Wireless won't be a part of the initial launch event, but the CDMA carrier has said it will likely offer Windows Phone 7 devices in 2011.