1.   Almost every PC today runs one version or another of Windows, so even a relatively minor upgrade of Windows is enormous news for the trade.

2.   But its new features are so compelling and so well done that this is more than just a minor upgrade.

3.   But sometimes, minor upgrades -- usually fixes for bugs -- are offered free.

4.   Its new features are so compelling and so well done that this is more than just a minor upgrade.

5.   Rather than delivering minor upgrades in a box via store shelves, Gates said new versions of the product will likely be available online.