Windows 8 and OS X Mountain Lion by the numbers

Like 2009, this year is one of dueling operating system upgrades, when the two biggest OS rivals face off with new editions.

We've covered both the Windows 8 and OS X Mountain Lion upgrades, and spelled out what's known so far about their prices, release dates, delivery methods, upgrade paths and more.

Now it's the turn of the numbers to tell their story.

0 -- The price of an upgrade to OS X Mountain Lion for buyers of new Macs who purchased their Lion-powered systems starting June 11. The program, called "Up-To-Date" by Apple, continues as long as either Apple or its authorized resellers sell Lion-equipped Macs. The free upgrade will be available from the Mac App Store after buyers fill out a form to be posted on this page of the Apple website. Read more...