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Clouding Microsoft’s Windows Profit Machine — Overheard

For Microsoft, MSFT 0.35 % Windows is hardly a bit player. Yet it is clear that the company’s once star performer is moving to a supporting role.

In a conference call Tuesday, Microsoft gave more details on its plan to change the way it reports financial results. Six business segments will be reduced to three, with the goal being more emphasis on the areas the company deems...