I ran into a problem this morning where I couldn’t turn off an Out of office notification for one of my users. Here’s the error message received when trying to access OOO from the Tools Menu in Outlook :
The command is not available. See the program documentation about how to use this extension.
MS KB823472 solved the problem for me. Here is the cause and resolution from this article :
Cause
This behaviour may occur if the following key is present in the registry:
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Resiliency
Resolution
Quit Outlook, rename the Resiliency registry key, and then restart Outlook. To do this, follow these steps.
1. Quit Outlook if it is running.
2. Press CTRL+ALT+DELETE, and then click Task Manager.
3. On the Processes tab, verify that Outlook.exe does not appear in the list of processes. If it does, click Outlook.exe and then click End Process.
4. On the File menu, click Exit Task Manager.
5. Click Start, and then click Run.
6. In the Open box, type regedit and then click OK.
7. Locate and then click the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook
8. Right-click the Resiliency subkey (if it exists), and then click Rename.
9. Type Resiliency.old, and then press ENTER.
10. Quit Registry Editor.
11. Start Outlook, and then click Out of Office Assistant on the Tools menu.
View the full MS KB for further information and ensure you backup the registry before attempting any modifications.