Microsoft is hard at work on getting the Mango update to Windows Phone 7 ready for the prime time later this year. The company has been talking up a lot of the new partners that will be offering smartphones running Mango. Last week Microsoft announced that Acer, Fujitsu, and ZTE would all be producing Mango smartphones. We already know Nokia is onboard too. The specs of the Acer W4 Windows Phone have been unveiled.