Microsoft sits on the edge of a product launch that is plainly among the most important in the company’s history. It comes at a time when the company’s traditional hardware partners are facing ferocious market pressure from the commoditization of their products, and of course, the juggernaut known as the iPad.

As can be expected, the company’s many cheerleaders and haters are out in full force. Pundits can and will pontificate on Windows 8’s chances. However, what might be more useful is looking at Microsoft’s other make or break moments. The upcoming launch is far from the first time that Redmond has fought with its back against a wall. A backward glance at these moments, and careful evaluation of them, may provide a better, ahem, window into the company’s chances this Winter.

First, let's get something out of the way. Most of what's really new in Windows 8 relates to the Metro touch interface, which is Microsoft's biggest bet on this OS generation -- a bet that's risky but necessary given the company's lack of presence in the growing tablet market. This is also how the folks at Redmond have figured could give a needed boost to its smartphone business (“Windows everywhere”), which is well behind market leaders, iOS and Android.

This review is based on my experience with Windows 8 using a desktop, so I've been treating Windows 8 like most computer enthusiasts will: as a direct upgrade from Windows 7 on my custom-built machine, just like I did with Vista, XP, 2k, and other previous Windows releases.

The lineup starts at $499 for the 32GB model or $599 with the addition of a black multi-touch TouchCover keyboard case, while a 64GB variant that already includes the TouchCover keyboard is available for $699.