Windows 7 Home Premium for $50?

Engadget reports that is has a leaked memo from Best Buy detailing Windows 7 pricing. If the memo’s correct – and it certainly looks real – here’s what we can expect:

> any PC sold with Vista Home Premium, Business or Ultimate between June 26th and the Windows 7 launch day (October 22nd) will be eligible for a free upgrade to Win7.

> starting on June 26th, Best Buy will begin “pre-selling” the Windows 7 Home Premium Upgrade ($49.99) and the Windows 7 Professional Upgrade ($99.99)

It isn’t clear if the upgrade pricing applies to those who own any version of Windows XP or any version of Vista, but that appears likely. Man, if those prices are for real, Microsoft has all the makings of a runaway hit on its hands.