I understand from http://www.microsoft.com/exchange/2010/en/us/exchange-2007-features.aspx
that TLS is enabled by default for server-to-server traffic.
I, also, read "SSL certificates are installed by default in Exchange Server 2007, enabling broad use of SSL and TLS encryption from clients such as Outlook Web Access and other SMTP servers."
I am unclear on a couple items:
1. Must I purchase 3rd party certificates?
2. Must I purchase a 3rd party certificate for both servers?
3. What is needed to encrypt data between the (full blown) Outlook client and its own Exchange Server (and then the remote domain)?
4. Is there a good step-by-step for forcing TLS exchange 2007 to exchange 2007 encryption?
(other than this one: http://technet.microsoft.com/en-us/library/bb123543%28EXCHG.80%29.aspx