Microsoft Corp is set to cut more than 6,000 jobs in an announcement expected early Thursday, according to sources familiar with the matter, as it trims its newly acquired Nokia phone business and reshapes itself as a cloud-computing and mobile-friendly software company. What could be the deepest job cuts in the companys 39-year history come five months into the tenure of Chief Executive Officer Satya Nadella, who outlined plans for a leaner business in a public memo to employees last week. Many of the cuts are expected to come from the Nokia unit, which Microsoft acquired in April for $7.2 billion, pushing up Microsofts headcount by a quarter to 127,000. Microsoft said when it struck the deal to buy the Finnish phone maker that it would cut $600 million per year in costs within 18 months of closing the acquisition.