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.
In the Database Utility window, select the database that you want to maintain, and then click Rebuild.
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.”
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:
Quit all applications.
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.
Click the plus [+] sign to add a new identity, and then type a name for the new identity. For example, type New identity.
The issue may stop temporarily if an Administrator logs into the Hyper-V host and runs the following command:
This issue occurs because the NT Virtual Machine\Virtual Machines special identity does not have the Log on as a Service right on the Hyper-V host computer. Usually, the Virtual Machine Management Service (VMMS) replaces this user permission at every Group Policy refresh to ensure it is always present. However, you may notice that Group Policy refresh does not function correctly in certain situations.