The Problem:
Domain users using windows 10 workstations on a Samba domain are unable to configure SME email accounts on Outlook 2013.
The Workaround:
To work around this problem, set the value of the ProtectionPolicy registry entry to 1 to enable local backup of the MasterKey instead of requiring a RWDC in the following registry subkey:
HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb
On my workstation I had to create the ProtectionPolicy entry...