Heading up a presentation in Japan at Microsoft Developer Forum 2011, Steve Ballmer was covering numerous topics including the acquisition of Skype. While discussing this year's Mango update, he set the feature count at 500. We were able to have a good insight as to what a good number of those features will be with MIX, but it's exciting to know that there are a plethora of promised additions to the platform that still need to be covered.

At the VIP Mango event tomorrow, it will be a busy day for the OS with Steve talking about OEMs and carriers as well as further detail surrounding 7.5. Microsoft is also looking to release their Mango developer tools some time soon. You can check out the entire Developer Forum session here, move the video slider to 29 minutes in and you'll witness WP7 goodness.

Via: Nanapho. Thanks tezawaly for the heads up!