exchange2003 s/mime

This is a discussion on exchange2003 s/mime within the Microsoft Exchange forums in Microsoft Tools category; Hi, Does anybody how good or bad is to allow the exchange2003 clients to be able to send secure messages using s/mime. As far as I undertsnad I need to set either a local or public pki server so the clients can use a certificate from it. Any details, how good does it work for *rpc over http* ?, owa? pop3? what if I have exchange2003 servers around the globe should I set a PKI server for each location? What if a user sned an encrypted message to a @hotamil.com address, will the @hotmail.com recipient be able to read this ...