Apple's upcoming Snow Leopard upgrade currently occupies two of the three top spots on Amazon's software top seller list. The pre-sale prices are $29 for a single computer and $49 for a 5-user family pack.

Microsoft occupied the same two spots last month when it was pre-selling the Windows 7 Home Premium edition upgrade for $50 and the Professional edition for $100.

There's a profound difference between the $29 Apple is charging, and Microsoft's $50 offer: Apple's price won't expire.

More: http://pcworld.com/article/169899/

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