Hello, I have Isa 2006 standard edition, Sharepoint standard edition, Exchange 2003. I set up one listener with 2 external port ip addresses, one address for sharepoint, one for OWA. Both use ssl. I followed the articles on "preauthenticating using ldap" and I can connect from outside to Sharepoint or OWA (forms based authentication) with no problem.
If I add OWA webparts, like the inbox or calendar to "mysite", it prompts for authentication again. I moved Mysites to the same web app in sharepoint as the main user pages, so it isn't being redirected to another web app. The firewall rules are configured to authenticate as the isa server.
I thought I would be able to log in to ISA (the sharepoint address), go to mysite and view my OWA without being prompted for another login, but I must have missed something. The exchange server is in a different forest, but there is a trust, and same user account works on sharepoint (domain1, same domain as isa server) and on Exchange (domain 2)