Outlook crashes if user presses Enter key on USB keyboard

In Outlook 2011, if I open a meeting invite and happen to press the Enter key (beside number pad) on my Apple USB keyboard, Outlook crashes every time. This is fully repeatable and also happens to colleagues. Works fine if we press the Return key on the USB keyboard or the Return/Enter key on the laptop keyboard.

We're running Outlook 2011 (14.3.0) on MacBook Pro machines with the Apple USB keyboard (http://store.apple.com/us/product/MB110LL/B/apple-keyboard-with-numeric-keypad-english-usa).

Any solutions?

Thanks,
Tim