According to the paper, Android remains the dominant platform in the region with a 33.7 percent share of impressions on the network, though its market share is gradually being eroded by iOS.
InMobi claims Apple's hand rose by 5 percentage points from November, finally resting at its current 28.4 percent share in February.
Impressionable
It's the start of what looks to be a similar trend observed by InMobi in North America, where iOS overtook Android for the first time in January, thanks to a surge in demand for Apple's iPhone 4S.
Outside of the big two, however, InMobi states RIM's share of the market is holding strong on 16.6 percent almost the same share as the firm amassed in November.
Breaking it down
When it comes to individual handsets, Apple rules the roost. iPhone 4 alone counts for 9.3 percent of European impressions on InMobi's network, with the original iPad holding third spot on 6.1 percent.
The highest placed Android handset was Samsung's Galaxy SII in fourth spot on 5.1 percent.
"We expect to see continued growth in iOS, driven by last weeks unveiling of the new iPad, as well as the reduced pricing of the iPad 2," said VP and MD for the EME region Rob Jonas, looking ahead.
"The iOS growth on our network and increased adoption of tablets overall align with the results of our recent Mobile Media Consumption Study, which reveals that European mobile consumers are already spending more time on mobile connected devices than TVs."
In all, InMobi's network across Europe grew by 63 percent during the 90 day period, equal to 15.2 billion monthly impressions.