Barence writes "Microsoft boss Steve Ballmer has blasted the company's own mobile operating system at the firm's Venture Capital Summit. One tweet from an attendee claims Ballmer said the company had 'screwed up with Windows Mobile. Wishes they had already launched WM7. They completely revamped the team.' Another claims Ballmer said 'we've pumped in some new talent. This will not happen again.' It's not the first time Ballmer has attacked Windows Mobile, having publicly stated that version 6.5 was 'not the full release we wanted.'"