Keychain access to Microsot_Intermidiate_Certificates
The password is blank for that keychain!

In the password window just hit Enter key without typing anything.

*I know it is a stupid thing to ask for a password that does not exist (unless it is set).

FYI, the Microsoft_Intermediate_Certificates keychain and the  Microsoft_Entity_Certificates) is used by MS Outlook for decryption of encrypted emails.*