That's not so unusual for a mature product line, but it has been something that Apple has tended to confine to the lower-end product and a move that indicates confidence in healthy sales volumes.

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The implied earnings growth rate of more than 15% is great for a company that has been around for more than 30 years and has a mature product.

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Office is the leading example of a mature product, one that has been "good enough" for many years, and thus not the sort of tech product for which users clamor for the latest-and-greatest upgrade (unlike, say, mobile phones).

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