OK, so we have an accounts forest (CompanyA.com) and a Resource Forest with Exchange 2013 which is hosted with a service provider (onthecloud.com). The environment consists of 2 x F5 load balancer's, 2 x CAS / HT and 2 x Mailbox servers.
There is a one way trust between the Accounts Forest and the Resource Forest. Just wondering if its technically possible to get SSO in this kind of setup (no basic authentication) without using ADFS?
Any pointers greatly appreciated.