Nokia has long enjoyed very good opinion and popularity in Poland -- as the go-to vendor, thanks to decently-priced, user-friendly and rugged phones. The second-hand market is huge, spare parts and accessories abound and experienced repair shops common.
Having said that, a few of my friends have gotten Windows Phone and all of them were disappointed, most of them returned them back in exchange for anything Android. Common complain was OS being disappointing for daily use, and app selection was lacking.
tl;dr
In Poland Windows Phone may outsell iPhones, but it still remains niche -- and you should also subtract frequent returns to get actual user base.