by default 2016 Exchange version uses MAPI so outlook is required on accessnode, but you can enable EWS for exchange 2016 as per below article providing additional permission for service account so that you can overcome outlook prerequisites for archive
by default 2016 Exchange version uses MAPI so outlook is required on accessnode, but you can enable EWS for exchange 2016 as per below article providing additional permission for service account so that you can overcome outlook prerequisites for archive