Jan 28 : Microsoft only edged past estimates for quarterly revenue in its crucial cloud-computing business on Wednesday and ramped up spending on artificial intelligence, disappointing investors looking for better returns amid intense competition. Its shares plunged more than 7 per cent in extended trading. Microsoft said revenue at its Azure cloud division grew 39 per cent in the October-December period, its fiscal second quarter. That compares with a consensus estimate of 38.8 per cent,