Apple's iOS comes in with a distant second place, while Windows Phone takes the fifth spot.
Asian suppliers say Microsoft is currently testing a smartphone design. But launching its own handset would require careful balance to avoid angering its partners that are shipping Windows Phone 8 devices.
Redmond will be happy to hear the results of this recent survey of IT managers.
Microsoft is reportedly giving all employees new Windows 8 PCs, Windows Phone 8 smartphones, and Microsoft Surface RT tablets.
About 5.4 million Windows Phone devices were sold in the quarter, for a 3.5 percent market share, up from 2.3 percent a year previously.
New Windows Phone 8 flagship smartphone garners universal plaudits.
Wireless charging, PureView camera, offline maps: Here's what you should know about Nokia’s new flagship Windows Phone 8 device.
The phones need to have a wow-factor that will generate buzz -- and sales -- according to the analyst.
Windows Phone has enjoyed favor recently, but some analysts warn that unless the Lumia line of Nokia Windows Phone 8 devices takes off this fall, it could mean the end of Nokia.