The big Windows Phone 7 launch event is on Monday Oct. 11th. The actual start of sales for the WP7 phones is expected to be in November in the United States. A leaked road map from carrier Three in the UK on Engadget suggests that the WP7 sales launch could be as soon as October 21st.
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The leaked document also says that Windows Phone 7 will launch with 2,000 apps. Three refers in the document to the Windows Phone 7 as Windows 7Phone. Not sure if that is a hint that Microsoft still might to find a shorter name. 7Phone looks neat. I would work for me going forward as I am sick writing Windows Phone 7.
The Windows Phone 7 launch event will be video streamed live.