40M Windows 8 licenses have been sold thus far, a Microsoft (MSFT) exec boasts, while adding the upgrade pace is exceeding that for Windows 7. It's unknown, however, if this figure includes enterprises who have access to Win. 8 through a subscription, but haven't necessarily upgraded. Otherwise, 40M would be an impressive figure for such a short amount of time, especially in light of industry conditions and reports of tepid enterprise interest. On Oct. 30, Steve Ballmer claimed 4M Win. 8 upgrades were sold in the first 3 days of availability.