From ZDNet:

“While for the same third-quarter in 2010 when the iPhone’s share of the market was just over 31 percent, the BlackBerry in this past quarter dropped to just 32 percent. The iPhone excelled this past quarter by significantly increasing its enterprise user share to 45 percent.

Android nearly doubled its share from last year, from slightly over 11 percent to just shy of 22 percent, leaving the Google mobile operating system in third place. That left Symbian in fourth place with a hefty drop from 12 percent to 7 percent, with Microsoft’s mobile market share dwindling to just over 5 percent.”

[ZDNet]