If you want to know more about Windows Phone 7, you might want to mark October 11 down on your calendar. Microsoft has been sending out invitations to media outlets for an October 11th event, in London, that should give us a better idea of what the company’s European, Windows Phone 7 roll-out plans look like. The event starts at 9:00AM ET and will last three and a half hours. Perhaps some hands-on time with official hardware? We think so. Only fifteen days until the event… let the countdown begin.