Microsoft has announced that Windows 7 has sold 150 million licenses to-date.
Back in January, Microsoft announced that Windows 7 was the fastest selling OS of all time. Today the company added to that with details that Redmond has sold 150 million licenses so far. Seven Windows 7 licenses are being sold every single second.
Microsoft announced that the company had sold 90 million licenses back in March, just a few days after after the expiration of the free use of Windows 7 Release Candidate.

They don't call it Windows "Seven" for nothing...
Okay, I'll shut up now.
The key issue for the longevity of Windows 7 is whether or not they extend support beyond January 2015. MSFT maintained XP support (and even sales) for as long as it did only because of intense pressure from its corporate customers.
edit: to be a little more clear i was talking about killerclick. not just a general bash apple slam fest.
The majority of software in existence is made for Windows systems not OSX. I would not shoot myself in the foot and reduce the capability of my machine and pay the premium that Apple expects for their products. I only wish more companies could produce laptops as aesthetically pleasing as the Mac Books
At several hacker competitions now OSX has been shown to be less secure than Win. The only reason there are more viruses etc for Win is that cyber criminals and weekend CompSci students with a grudge are actively targeting Win machines.
I thought no WAY are they selling more than 6 copies per second! I mean, clearly 5 per second is the gold standard for new operating systems - but SEVEN??? INCONCEIVABLE!
The same should especially remain true regarding licenses distributed to partners, OEM's, volume licensing and bulk sales. A "sold" license is what it is, a sold license.
They don't call it Windows "Seven" for nothing...
Okay, I'll shut up now.
Who cares? Do you judge OS X sales by the box, or rather, by the upgrade? A purchased copy is a purchased copy, no matter how it was obtained.
It would be more amazing if it were 7 copies of windows 7 every 7 seconds. Yes, I know it would be less, but at least it would be more fun to say.
And for years AOL was the number one ISP In the U.S. I am sure that means it was the highest quality product. Sales do not equate to being the best.
... Wouldn't they say one a second?
I'd agree with Walt526 on his ideas. Especially with the price of upgrading, I know I personally don't want to dump that much into just an operating system every 2.5ish years. I already throw enough what with hardware upgrades.