When you open file attachments that are considered safe, Outlook places these attachments in a sub directory under the your Temporary Internet Files directory as an extra precaution. When Outlook first tries to use a temporary file, it examines the registry to determine whether or not the TEMP OLK folder has already been created. If yes, it uses the folder. If no, it creates a random folder then stores the path.
The location:
Registry key OutlookSecureTempFolder using the MAP below:
| Outlook 97 | HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Outlook\Security |
| Outlook 98 | HKEY_CURRENT_USER\Software\Microsoft\Office\8.5\Outlook\Security |
| Outlook 2000 | HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security |
| Outlook 2002/XP | HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security |
| Outlook 2003 | HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security |
| Outlook 2007 | HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security |
| Outlook 2010 | HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security |
http://www.groovypost.com/howto/microsoft/outlook/find-the-microsoft-outlook-temporary-olk-folder/