Alex Wilhelm for The Next Web writes:
Microsoft has sold 4 million upgrades for Windows 8 in the last three days, the company announced this morning during its Build 2012 conference.
According to the its CEO, Steve Ballmer, enthusiasm is “very high” for the product. This figure includes both individual purchases, and those units sold to stores that they expect to sell.
Microsoft adds that it has also sold “tens of millions” of copies of Windows 8, a $39.99 upgrade, to its manufacturing partners.