“It is something we are going to have to address and explain to customers our method and process and quality approach and what went wrong in that case and how we are making sure that it does not happen again,” Ballmer told Network World during an exclusive interview at the SharePoint Conference.

Ballmer spent part of his morning keynote to open the show explaining how Microsoft plans to push the cloud version of SharePoint and create options for users to run their applications and store data in the cloud.

He said he would have to earn back the trust of Sidekick users, some of whom have reportedly . 

“Non-Sidekick users, we are not earning their trust back but I think people are going to say, ‘Hey, look, show me what you are doing to insure this does not happen to me,’ ” Ballmer said.