http://support.microsoft.com/kb/2360509

Step 4: Rebuild the database

  1. Quit all applications.
  2. Hold down the Option key on the keyboard, and then start Outlook 2011.

    Note You can also browse to the Database Utility by opening the Application folder and then opening the Microsoft Office 2011 folder. Open the Office folder, and then double-click Microsoft Database Utility.app.

  3. In the Database Utility window, select the database that you want to maintain, and then click Rebuild.
  4. The Rebuilding Main Identify window will open and show the progress. When the operation is completed, you will receive the message “Your database was rebuilt successfully.”
  5. Click Done.
Select an identity

Start Outlook and see whether the problem is resolved. If the problem is not resolved, go to the next step.

Step 5: Create a new identity

If you are using Outlook in more than one capacity, such as at home and at work, Outlook may be configured to have multiple identities. Each identity stores separate sets of e-mail, address books, tasks, calendars, account settings, and more.

If Outlook has multiple identities, one of the identities might be damaged. Try to use a different identity to determine whether this is the problem. If an identity is damaged, you must create a new identity to resolve this problem.

To create a new identity, follow these steps:

  1. Quit all applications.
  2. Hold down the Option key on the keyboard, and then click the Outlook icon in the dock. The Microsoft Database Utility will open.

    Note You can also access the Microsoft Database Utility by opening the Application folder and then opening the Microsoft Office 2011 folder. Open the Office folder, and then double-click Microsoft Database Utility.app.

  3. Click the plus [+] sign to add a new identity, and then type a name for the new identity. For example, type New identity.
    Create a new identity

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