Applications digitized existing real-world processes, such as word-processing, payroll and inventory.

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During basic testing of real-world use (web surfing, multimedia playback, word processing, etc.), it was as zippy as we could hope.

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Founded in 1975, it rose swiftly to dominate the world of personal computing with its Windows operating system and Office suite of word-processing and other productivity tools.

ECONOMIST: The software giant is grappling with a mid-life crisis