Microsoft today announced that they have already sold 40 million licences of Windows 8. This was pretty fast, in just 1 month, to get 40 Million PC’s running Windows 8!
Tami Reller, the Windows Chief Marketing and Financial Officer, said in his presentation:
The journey is just beginning, but I am pleased to announce today that we have sold 40 million Windows 8 licenses so far
The launch of Windows 8 at the end of October also saw the grand opening of the Windows Store. There were more apps in the Windows Store at launch than any other app store at their launch and since then, the number of apps in the Windows Store has doubled. A number of apps in the Windows Store have crossed the $25,000 revenue mark and the developer keeps 80% of the revenue they make off downloads for the life of their app.
Source: Windows Team Blog