Yesterday afternoon, on the Exchange Team Blog, the Exchange product team posted that we are seeing issues with database corruption after installing Exchange 2007 SP3 RU3.
In short, we are recommending all customers uninstall Exchange 2007 SP3 RU3 on all Mailbox and Transport Servers.
Steps for how to do this are included in the blog post.
You will need to search for the events mentioned in order to determine the actions that you should take.
Additionally, we apologize that this happened.