KIC EWS protocol to a Shared Mailbox using a Service Account

Issue:


Unable to connect to EWS with service account


Resolution:


Specify the user's full domain name in the 'User name' section of the mailbox settings. 


Examples of User Name configurations:

DOMAIN\user\SharedMailbox@domain.com

DOMAIN\user@domain.com\SharedMailbox@domain.com
(in this case, DOMAIN is ignored and @domain.com is used)

DOMAIN\user\SharedMailbox
(will work if DOMAIN == domain.com, which is not always the case)