The following instructions step through the process of configuring your Office 365 Exchange Online account with Apple Mail for macOS 10.14 or higher, which is required to support Modern Office 365 - Apple Mail Configuration Office of Information Technology.

If you've already been migrated to Exchange Online, instead see Configure Exchange Online with Outlook for macOS or Mac Mail.

Tip: Press command ⌘ + SPACE on the keyboard at the same time to search for the.
Looks like the latest version of Mac Mail on Sierra doesn't work with Exchange 2016. It works fine with our Exchange 2013 server. I am getting Unable to Verify account name or password. Outlook 2016 for Mac works fine and all windows clients are working fine so it seems to be a Mac Mail issue. Hi You may follow this below article for a work around to.

To set up Outlook 2016 for macOS to access your Exchange account at Indiana University:

On the welcome screen that appears when you start Outlook for the first time, select Add Account. The 'Accounts' preference window will open; if neither it nor the welcome screen appears, from the Tools menu, select Accounts.
In the bottom left of the 'Accounts' preference window, click the + (plus sign) button, and then select New Account....
In the window that opens, enter your Exchange account email address (for example, dvader@iupui.edu), then click Continue.
If Outlook doesn't automatically detect that you're configuring an Exchange account, click Choose the Provider, and then Exchange.
In the new window, enter the following information, making sure Configure automatically is selected:
- Method: From the pull-down menu, select User Name and Password.
- E-mail address: Your Exchange account email address, for example, dvader@iupui.edu
- DOMAINusername or Email:ADSusername, replacing username with your IU username.
- Password: Your IU passphrase
- Server (optional): Usually not necessary to complete this field, but you may enter https://ews.exchange.iu.edu/ews/exchange.asmx
Click the Add Account button, and then click Done.
After the initial sync is complete, with the 'Accounts' window still open and your new Exchange account selected, click Advanced, and verify the following settings:
- Microsoft Exchange
  - Server:https://ews.exchange.iu.edu/ews/exchange.asmx
  - Check Use SSL to connect.
- Directory services
  - Server: Optionally, add one of the following servers to use directory services:
    - IU-MSSG-ADSDC01.ads.iu.edu
    - IU-MSSG-ADSDC02.ads.iu.edu
    - IU-MSSG-ADSDC03.ads.iu.edu
    - IU-MSSG-ADSDC04.ads.iu.edu
    - IU-MSSG-ADSDC05.ads.iu.edu
    - IU-MSSG-ADSDC06.ads.iu.edu
    - IU-MSSG-ADSDC07.ads.iu.edu
    - IU-MSSG-ADSDC08.ads.iu.edu
  - Check Use SSL to connect.
Adjust settings in the Delegates and Security tabs as needed. Consult your IT support personnel regarding these settings.
Click OK to exit the advanced settings.
Click the Show All button to reveal the other Outlook settings, and then click Calendar. Next to 'Default time zone for new events:', make sure it is set to the correct time zone. Especially if you have an Indiana city set for your Mac's system-wide time zone setting, make sure it is not set to Indiana (East), but instead to Eastern Time (US & Canada).
Close the preferences window to begin using Outlook.

The initial connection to Exchange will sync account content to your computer. This can take an hour or more for accounts with a large amount of data.

Mail User Guide

Use the Mail app to send, receive, and manage email for all of your email accounts in one location. Simply add the accounts—such as iCloud, Exchange, Google, school, work, or other—you want to use in Mail.

Add an email account

The first time you open the Mail app on your Mac, it may prompt you to add an account. Select an account type—if you don’t see your type, select Other Mail Account—then enter your account information.
If you already added an email account, you can still add more. In Mail, choose Mail > Add Account, select an account type, then enter your account information. Make sure the Mail checkbox is selected for the account.
If you’re using an account on your Mac with other apps, such as Contacts or Messages, you can also use that account with Mail. In Mail, choose Mail > Accounts to open Internet Accounts preferences, select the account on the left, then select the Mail checkbox on the right.

Temporarily stop using an email account

In the Mail app on your Mac, choose Mail > Accounts.
Select the account, then deselect the Mail checkbox.
Now the account’s messages are not shown in Mail.

To use the account again with Mail, select the Mail checkbox; the account’s messages are shown again (they don’t need to be downloaded from the server again).

Exchange Settings For Mac Mail

Remove an email account

Exchange Account For Mac Mail Settings

When you remove an email account from Mail, the account’s messages are deleted and no longer available on your Mac. Copies of messages remain on the account’s mail server and are still available (from webmail, for example).

Exchange Account Mac Mail Not Working

Important: If you’re unsure whether messages you want to keep are still on the mail server, move or copy them to a mailbox stored on your Mac (the mailbox appears in the On My Mac section in the Mail sidebar) before you delete the account in Mail.

Office 365 Exchange Settings For Mac Mail

In the Mail app on your Mac, choose Mail > Preferences, then click Accounts.
Select an account, then click the Remove button .
Note: If the account is used by other apps on your Mac, you’re asked to remove the account in Internet Accounts System Preferences. Click the button to open Internet Accounts, then deselect the Mail checkbox for the account. To stop using the account in all apps, make sure the account is selected, then click the Remove button .

Exchange Account Mac Mail

See alsoUse SSL to connect to the outgoing mail server in Mail on MacView email account information in Mail on MacFree up storage space for email accounts in Mail on Mac