If you've been selling a product for more than 10 years and you've shipped hundreds of millions of units, you'd think your customers would know what they're buying. For Microsoft, that's not the case. The culprit is the hopelessly confusing, practically Byzantine Windows licensing structure, which consists of a maze of terms and conditions that define (and ultimately restrict) what you can do with Microsoft Windows in your home or business. I've identified five problems with Windows licensing. If you think they don't affect you, think again.