SAN FRANCISCO (AP) — Microsoft believes the latest version of its Windows operating system is off to a great start, but it’s going to take more than that to prove the revamped software will win over enough people to revive the slumping personal computer market.

About 40 million licenses to Windows 8 were sold in its first month on the market, according to figures that Microsoft released in conjunction with the company’s annual shareholder meeting held near its Redmond, Wash., headquarters.