I have been trying to setup RPC over HTTPS and have only one hurdle left to overcome to get this implemented for our remote users. I installed our own CA server here internally and have used it to assign the SSL certificate for the Exchange server. However, I can't seem to get the client computers that are not members of the domain to trust that certificate. On client computers that are memebers of the domain I can install the certificate just fine and it works no problem, but this is not so with machines that are not menbers of the domain. I tried installing the certificate in the Trusted Root Authority, but when a client tries to access our webmail they still get the message stating that the certificate is not trusted. From what I understand, this certificate must be trusted first prior to being able to get RPC over HTTPS working. Any ideas?