Microsoft has officially posted in their blog this statement:
The Office 2011 SP2 release improves database resiliency and detects inconsistencies that went unnoticed prior to this release; however some users have experienced issues related to corrupted databases after the latest updates. We have support and workarounds available for you in the following situations (Click on link below to read Microsoft's full blog post):
You may download service pack 2 at Microsoft official download site:
Thank you for your partnership!