Verify that the account settings are correct. A demo on how to setup an Exchange account on the Outlook for Mac OS app. Enter your email ID and password for NMU.
Follow these steps to add an Exchange account to Mail.On the Tools menu, choose Accounts. EWS should be setup when you install Exchange and runs as a web service on your Client Access servers. Add an Exchange EWS account to Mail. For best results, make sure that your software is up to date before setting up an Exchange account in Mail. This is the prefered way to set up your exchange account.
Google licenses Microsoft's technology so that it can provide Google Sync service for Gmail, Contacts, and Calendars.Open Microsoft Outlook on your MacBook. If your Exchange server isn't providing the needed setup information, contact your Exchange administrator. Enter your exchange account information and select Add Account. Select your Exchange account from the list of accounts. If you have a paid Google account, you can set up Google Sync through an Exchange account on the iPhone, as well. Deselect the Automatically manage connection settings checkbox.