The full AdDuplex report is now out, and in it AdDuplex does some speculation about the number of Windows Phones in current use.
They estimate around 12 million Windows Phone 7 handsets are still in use, decreasing at 2% every month.
At the same time they estimate around 38 million Windows Phone 8 handsets are in use, with this number still increasing. If 8 million handsets are sold in a quarter this number should increase by around 2.5 million per month.
This is a significant installed base, but unfortunately remains dwarfed by the other mobile ecosystems. In fact according estimates by Evercore group the iPhone hit 50 million in September 2010, 3 years and 3 months after its first release.
On the other hand by that measure Windows Phone is tracking the iPhone well, with the OS also hitting 50 million active users 3 years and 3 months after release, having been introduced in October/November 2010.
The iPhone hit 100 million active users only a year later, in September 2011. Do our readers think Windows Phone can emulate that feat? Let us know below.