On Monday morning Microsoft officially announced their reentry into the smartphone business with a new mobile operating system called Windows Phone 7. In the evening they hosted the Microsoft Open House featuring many of Microsoft's products which are also components in Windows Phone 7. The products include Bing, Windows 7, Windows Live, Internet Explorer, Xbox 360, Office, Zune and mouse and keyboard offerings. Guests were able to test out all of the above products along with a few of the new Windows Phone 7 mobile phones. Be on the look out for the Windows Phone 7 review on October 20th.