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Staples announced it will close 225 stores by 2015. It's not that our love affair with the Post-it note is over, or that paper is finally and completely dead. Instead analysts say the problem is the people aren't using as many office products anymore -- and they are shopping for them online.

As we use more gadgets, we use less paper, ink and toner. (That's the Staples holy trinity of products.) And when we do buy supplies, we often order from competitors like Amazon.

But Staples is fighting back, by strengthening its business-to-business offerings, like medical and dental supplies.