You need to make a "Custom Inventory" to look for registry value with path.
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles
Check for "001f6700", it is path to PST file but in hex.
I checked for this key on Windows 7 with MS Office 2007.
And when You will have data in database then you can make sql query.