I'm migrating from Exchange 2010 to Exchange 2013 and on the final stages. I pointed the external and internal DNS records to Exchange 2013. I moved one mailbox to Exchange 2013 and then tried to create a new Outlook client profile and bring the mailbox up however the client would not connect. It stated trying to connect encrypted and unencrypted. It did not work. I checked nslookup and the IPs are all set pointing to Exchange 2013. I then checked my certificates. I have a certificate that is a wild card. When I checked assigned services on my wild card it had IIS and SMTP assigned. Also in IIS on the default site bindings what should you use as a certificate on the two https settings? Originally they were the local generated certificate. I changed them to the wild card no luck. Please assist.