Hybrid Fabrikam
On Premises Contoso
On Premises
User Ben
Client Access
Server
Microsoft
Federation
Gateway
Exchange
Online
Mailbox
Server
CLoud User
Ted
On-premises
Exchange
Ben requests
free/busy info for
Ted@Fabrikam.c
om
Ben
Ted@Fabrikam.com
ted@Fabrikam.Mail.onmicros
oft.com
The issue: OAUTH or
DAUTH it does not
matter, the trusts are
not transitive
