Microsoft fell short of estimated Azure revenue growth this quarter.Kevork Djansezian/GettyShares fell in post-market trading after Microsoft released its fourth-quarter earnings report.Its Azure cloud unit's revenue grew 29%, slightly slower than analysts had expected.CEO Satya Nadella highlighted the company's longterm AI goals during the call.Analysts had big expectations for Microsoft's cloud growth this quarter — and the tech giant seems to have fallen short of them even as it pumps money into its AI plans.Microsoft released its Q4 earnings Tuesday afternoon, and the company grew its Azure cloud unit's revenue by 29%.