The update fixes this problem, so if any corrupted files are detected, they'll be successfully rebuilt instead of stalling Outlook. Previously, a small group of users who had installed SP2 found that they needed to rebuild their Outlook database but were unable to do so, making the software unusable.
Less than a week after Microsoft stopped pushing out its Service Pack 2 update for Mac users with Office 2011, it's offering a patched version that should clear up the issues people experienced with Outlook.