I have a single server OCS 2007 setup, standard edition. No public IM, just the IM/Conferencing server. I have maybe 30 users, using communicator 2007. My SSL certificate (in house cert) is about to expire. I want to renew the certificate and make sure there are no connectivity issues for my users. Can someone give me some pointers on the process to renew the cert. I know how to apply a new cert to the server, but there is no option in the wizard to renew the existing cert. I assume I have to generate a new certificate and apply at the server itself, then get the users to update their local cert with the new one. I just want to make sure I do things in the right order, as I don't want to interrupt users of the system. How can I apply a new cert without kicking all existing users off the system?