Microsoft has finally and officially launched the Windows Phone 7 Series at the Mobile World Congress 2010. The new platform integrates Xbox LIVE games and Zune music and videos for the first time into a mobile platform. What makes this new version interesting is that all Windows Phone 7 Series handsets will feature a Bing dedicated hardware button for one-click access to Microsoft’s search engine. There will be six Windows Phone hubs: People, Pictures, Games, Music + Video, Office and Marketplace. The first Windows Phone 7 Series smartphones will be available in time for the 2010 holiday season. Watch the video after the jump to get more details.