Up from 11,500 in April.
Microsoft will be pleased with the hike, but aware that its a long old way from iOS and Android, which count 425,000 and 250,000 respectively.
These are interesting times for the WinPho 7 platform, which has struggled to establish itself in the face of competition from the aforementioned OSs, and from RIM.
However, it's currently wooing cast-adrift webOS developers, looking ahead to the first Nokia WinPho and preparing for its souped-up Mango upgrade and devices.
Indeed, on Monday, Microsoft opened up Windows Phone Marketplace to accept developers’ Mango app submissions.