Windows Phone 7.5 Mango update has already begun to roll out and users can expect a notification about the same within next four weeks. Microsoft has decided to roll out this update in a planned way so that all the Windows phone devices should receive the update as soon as possible with proper firmware for their devices. More than 98% WP customers can expect to receive the update for now and rest of the users can expect the update according to their global location, carrier and phone model.
The delivering process of Mango update to all the Windows Phone devices at once requires proper balance and also to make sure about the speed and quality to deliver the update to the users with proper firmware is necessary.
Microsoft has decided to first make Mango update available to only 10% customers and after that 25% of customers will receive the update and finally if everything goes fine then rest of customers will be getting it within next four weeks.