Here is a nice Q&A with Microsoft CMO & CFO Tami Reller,

Highlights:

100M Windows 8 Licence have been sold in 6 months!

-  First Official Windows Blue mention! Windows Blue is a codename for an update that will be available later this year

- Number of apps in the Windows Store has increased 6x since launch.

250M people are using SkyDrive.

400M active Outlook users.

- Outlook-Skype integration

Full article: http://blogs.windows.com/windows/b/bloggingwindows/archive/2013/05/06/windows-8-at-6-months-q-amp-a-with-tami-reller.aspx