I wrote an article about Mapi over HTTPS just few hours ago and noticed that MS has a new KB article for an issue noted related to Mapi over HTTPS. You may experience issue connecting to Exchange Server 2013 SP1 with Microsoft Outlook 2013 with SP1 using Mapi over HTTPS even when all settings on server, load balancer and reverse proxy are correct.
You can follow KB Outlook 2013 may not connect using MAPI over HTTPs as expected to resolve the said issue.
Open registry editor on the client computer and navigate to the path HKEY_CURRENT_USER\SOFTWARE\Microsoft\Exchange and change the value of MapiHttpDisabled to 0 as show below
If you do not see this DWORD value in registry editor, you do not need to create it manually.