When doing FreeBusy lookups from Exchange to Domino, after turning on the advanced logging in Outlook, you see the following error in Outlook advanced logging:
Exceeded the number of Autodiscover redirections for e-mail;SMTP:email@example.com. The maximum allowed redirections are 3 (this number may vary)
Lack of host file entries on the Exchange CAS server in the environment
Add host file entries on each Exchange CAS server in the environment:
Default location of host file:
Where 184.108.40.206 is the IP of the CMN box hosting the CMN FreeBusy WebServices.