Yesterday morning, at roughly 10 a.m. Pacific time, Microsoft began rolling out the Mango update to phones around the world. This news makes Windows Phone users pretty excited. Windows Phone 7.5 (aka Mango) is the largest and most feature-packed software refresh to date.
Also have in mind that that today is just the start. Their plan is to ramp up delivery gradually—but make the update available to most existing customers within 4 weeks.