When setting up Outlook Profile on a NON domain joined computer the Setup Continuously Asks for Credentials!
found by trial and error that entering domain\username is accepted.
Side Note: If I change the 'A' record for mydomain.com to an account with a shared SSL
if I set it back to clients normal website which has NO ssl - not even a shared one it will only ask about 3-4 times
but again if I enter domain\username the setup completes fine !!
JK