Other Mango enhancements include browser support for HTML 5 and hardware-accelerated graphics, as well as YouTube, LastFM, and Slacker integration with Windows Phone's Music + Videos hub.

Bootleggers Beware

Version 7.5 updates will be paired with software updates from handset manufacturers, and Microsoft is advising Windows Phone 7 users to avoid bootleg copies of Mango.

"This matched and paired firmware has been painstakingly tuned so your phone--and apps--work with all the new features of Windows Phone 7.5. Since your phone requires the proper firmware to function as designed, my advice is simple: steer clear of bootleg updates and homebrew tools," writes Hautala.

Microsoft issued a , when it warned WP7 users to avoid an unauthorized tool for downloading two software updates.