Complex sentence: It was an early product in the Microsoft portfolio--different from its other software which was largely business-oriented--and at 25 years is the longest-running franchise, predating Windows by three years.
Split into simpler sentences: It was an early product in the Microsoft application portfolio--and differed from Microsoft's other software which was largely business-oriented --. At 25 years is the longest-running software product line for Microsoft, predating Windows by three years.