Research In Motion co-CEO Mike Lazaridis confirmed on a conference call Thursday morning that all BlackBerry services have been restored globally. The co-chief had issued a video apology to customers earlier on Thursday, offering reassurances that the company was doing everything in its power to resolve service interruptions that had extended into their fourth day. A switch failure followed by a large backlog of emails is being blamed for the service outage, which affected millions of BlackBerry users across Europe, the Middle East, Africa, India, North America and South America. RIM said it is putting fixes in place to prevent a recurrence of this issue in the future, and it is currently considering how it might reimburse carriers and BlackBerry users for the disruption caused by this week’s outages.