Windows Phone 7.5 (Mango) Now Required to Download AppsMay 23, 2012 1 Comment
We warned you guys that this would happen and now it finally has. You are now be required to be running Windows Phone 7.5 (Mango) on your devices to download apps from the marketplace.
In order to keep moving forward, Microsoft decided this crucial step must be taken.
I dont think this is a big deal though as Mango has tons of improvements and there really isnt anything holding anyone back.
Source: Windows Phone Blog