Aqui está um arquivo REG que cobre o Outlook 2013 e 2010:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Office.0\Common\ContactCard]
"TurnOffHoverFunctionality"=dword:1
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Office.0\Common\ContactCard]
"TurnOffHoverFunctionality"=dword:1