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Features interact combinatorially, which introduces complexity.

Faxing isn't a great example, since from the perspective of most other features, it's probably just a special case of printing, but you can imagine it made it harder to build a web-based version of Word (what number are you faxing from? How does the computer in the MS data center contact or emulate it?)

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Heh, there is some saying along the lines of "Any one customer only uses 10% of the features your software provides, the problem is each customer users a different 10%"

It's almost always a better bet to add more complexity to your product to capture more market than to make it as simple as possible.

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