Hi @damboyan ,
if you have overridden the Outlook script in Hook then, assuming your issue was similar to @eMaX’s above, deleting your override would revert to Hook’s built in version of this script, and solve your problem.
Here’s how: in Hook > Preferences > Scripts pane. Overridden scripts have a * in left pane. You can remove the override by clicking the - button on bottom left when the script is selected. Just select the Outlook script on the left and click the - button at the bottom left of the pane.
(A Bear user ran into the same thing with respect to Bear last year: Hook+Bear+OmniFocus).)