Can anyone shed some light on permissions required for a service account to access mailboxes in Exchange using either WebDav or EWS?
We have an application which needs to read mailboxes using a service account and the only combination which seems to work is to allow "FullAccess" at the Mailbox level to the AD Account we are using to connect via WebDav or EWS.
Apparently there is no way to do a ReadOnly access via WebDav or EWS?
I have read on several forums that this is just the way it is, I'm fine with that but does anyone know why? If I could give clients a good explanation or even point them to some official documentation from M$ that would be much better than them just having to take my word for it.