Microsoft didn’t mention numbers but the news around Windows 7 — its much-ballyhooed operating system — is good, very good, according to CEO Steve Ballmer.

Windows 7 has sold twice as many copies than any previous version of the operating system in the same initial period, he said at the company’s annual shareholding meeting yesterday.

Windows is one of the biggest sources of Microsoft’s profit — or about half its $20 billion in operating income last year. Post staff