SAN FRANCISCO  As other high-tech companies cut back on their research labs, Microsoft continues to increase its ranks of free-rein thinkers.

The company, which has research labs in Redmond, Wash.; Beijing; Cambridge, England; Bangalore, India; and Silicon Valley, will announce plans on Monday to open a sixth lab, in Cambridge, Mass., in the Boston metropolitan area.

These are labs where people focus on science, not product development. To lead the new lab, the company has appointed one of its veteran researchers, Jennifer Tour Chayes. Dr. Chayes, 51, who has a doctorate in mathematical physics, said, “We believe that in the long run, putting money into basic research will pay off, but you have to wait longer for it.”

Microsoft, beset by competitive pressures from companies like Google, sees first-rate research labs as more important than ever. The company, which made a $44.6 billion bid for Yahoo last week as one way to compete with Google, wants a set of labs in place that can develop business opportunities that will pay off well into the future.