4M Windows 8 upgrades were sold to consumers during its first 3 days of availability, Steve...

4M Windows 8 upgrades were sold to consumers during its first 3 days of availability, Steve Ballmer discloses at Microsoft's (NASDAQ:MSFT) BUILD conference. An aggressive upgrade price of $40 has something to do with that figure. John Paczkowski notes Windows 7 sales (including new PCs) totaled 175M in their first year, and that Microsoft has a total base of 1.25B PCs. Reviewers continue to complain about using the new UI with a keyboard/mouse, but some users like the revamp, and investor expectations are pretty low at this point. (live blog) (more)