Microsoft Windows CFO Tami Reller today confirmed that Windows
Blue will be free. Reller also confirmed the name Windows 8.1 which was recently seen in leaked development builds of the OS. Microsoft revealed that the update will be free and available from the Windows Store for all Windows 8 and Windows RT users. Microsoft reiterated that the Windows 8.1 Preview will ship on 26th June for both Windows 8 and Windows RT
Tami Reller, speaking at the JP Morgan Technology, Media and Telecom conference has also announced that the Windows Store now has more than 70,000 apps since launch!