Ok, I just read to whole scenario that was posted by AdamHolmes and the responses by Simon and Sembee. I too am running into somewhat of the same issue however I do know that I only put the ssl cert on the FE server and enabled the appropriate setiings on the RPC tabs (system manager) for the BE and FE servers. OWA works fine, The error is "Your Microsoft Exchange Server is Unavailable". I am able to RPC into other servers. I also looked at the settings in Outlook. As I am most familiar with the settings for an SBS server, my concern might be focused on the principal name being used, should this be msstd:mail.mydomain.com or msstd:feservername.mydomain.com ?
Any other suggestions to look at and resolve this?
BTW I am logging on with the credentials ADdomainname\username and password