I have a SBS 2011 setup. I have the subdomain autodiscover.domainname.com pointing to the server public ip, and if I go to whatsmydns and type in autodiscover.domainname.com it points correctly.
When I do an nslookup autodiscover.domainname.com it points to the correct server wan ip.
When I do a nslookup srv it shows correctly the local lan ip and then it gives me information on the Linux server that is hosting the organizations website.
When I try to setup outlook off site it pulls an ssl cert from the Linux server that is hosting the organizations website?