Details leaked about Microsoft's $15 Windows 8 Pro upgrade offer earlier this month, and we are now able to confirm it will run from June 2nd to January 31st, 2013, according to one source familiar with the company's plans. Microsoft Store customers who purchase a Windows 7 PC from June 2nd will be offered a Windows 8 Pro upgrade for only $14.99. The limited-time "Windows Step-Up Offer" will run until January 31st, 2013 — providing upgrades for holiday and sales shoppers.

Microsoft Store customers who participate in the Windows 8 Pro upgrade offer will also be invited to exclusive workshops to learn more about Windows 8. Microsoft will also supply a $20 Microsoft Store gift card in exchange for attendance at one of its planned workshops. With the free Windows 8 Pro offer available for PCs running Windows 7 Home Basic or above, we'd expect this offer to be popular over the back-to-school and holiday periods.