Have Exchange2010 CAS server OWA is allowed to all users.
The CAS server is using third party trusted certificate (SAN).
I was asked to find the way to configure the server so users can communicate between partners company via encrypted email.
I thought of using S/MIME, Reading some tech notes and found that both party should use certificate and each others should know the public key if we go for S/MIME.
Experts up there know a solution to accomplish this S/MIME .
Do i have to install certificate for users from third party where I got the SAN for CAS server?
if that case Do we have to by certificate for each computer/users? say for an example we have 100 users so does the partner company.