We need to implement TLS for email transport between us and a client. We run Exchange 2007. I had initially turned off TLS as I didn't see a need for it and I couldn't get all my clients to authenticate properly with it. Now I have a client that would like us to do it with them. I am looking for a soup to nuts "how to" that would include "gotchas" regarding client access and regular incoming non-TLS mail.
We use Outlook 2003, Blackberries (No enterprise server, they IMAP in) and iPhones.
Anyone have anything good? I've read a few that look too easy.