An anonymous reader writes: After reporting its fourth quarter earnings yesterday, U.S. tech giant Microsoft has tipped its cloud and mobile software units as the drivers behind its new strength. Microsoft’s share price rose 6% in after-hours trading despite financials showing a 15% year-on year drop in profit, and a 10.1% fall in revenue over the last three months of 2015. However, investors were still reassured by the company’s cloud performance. Microsoft also recorded a positive jump for its mobile devices business. Surface revenue grew 29% in constant currency terms, led by the recent launch of the Surface Pro 4 and Surface Book. The company’s gaming and digital content unit similarly reported positive growth, with monthly active users on its Xbox Live platform rising 30% year-on-year, to 48 million.