I was trying to open the mail file of my user to intended mail server using his id file however an error occurs, "Server Error : The server's Domino Directory does not contain any cross certificates capable of authenticating you". Just wondering why he's encountering such issue since we haven't changed his certifier nor renamed his username yet? So what I did was, I re-certified his mailfile using the "Certify" under "Certificate" in server configuration. It works and so I have closed the ticket for this incident. Now, my question, Is there a difference between "Certify" to "Cross Certify"? I was supposed to use the latter to this issue since it was indicated to the probelm, but I doubted because I'm not confident of using it. Please give me some advise. Thanks!