Microsoft has released an update for Microsoft Office Outlook 2007. The update corrects the following issues:
A calendar item that is marked as private opens if it is found by using the Search Desktop feature.
Performance issues that occur when users work with items in a large Outlook Personal Folders (PST) file or Outlook Offline (OST) file.
Detailed information about the update is included in the Knowledge Base article Description of the update for Outlook 2007: April 13, 2007. You can download the update from the Microsoft Download Center by visiting Update for Outlook 2007 (KB933493).