Cloud is the big engine for Microsoft bulls, and it disappointed in the latest quarter. That's likely the biggest driver of the pressure on Microsoft's stock, which fell more than 4% in Wednesday's extended session.

Microsoft’s vast cloud division posted slower growth than Wall Street forecast as the tech group struggled to keep pace with customer demand for artificial intelligence-related services. The Seattle-based software group beat analysts’ expectations for revenue and net income in the quarter ending in December,

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