I have ADFS and office 365 completely set up and configured for SSO, using an ADFS server and ADFS proxy.
For internal users, I have IIS configured on the adfs server to redirect companynamemail.com to http://Outlook.com/owa/companyname.com so that the users, instead of having to go through portal.microsoftonline.com, type in thier user name, click the link, and then login, they just go to companynamemail.com, and it performs the SSO
I'm trying to find a way for external users to have a similar expeirence, I know that they will have to login because they arent authenticated through the domain, but I want thier portal to be companynamemail.com. I tried using the adfs proxy to do the http redirect, but it forwards without allowing them to login and gives an error.
I'm thinking about writing the redirect into the default website, but I'm wondering if I can do it with a redirect or a/cname record.