Step 1
Open Launchpad (Depending on your MacOS version it will look like one of these)
Step 2
Click Mail
Step 3
Click Mail, then Preferences
Step 4 - If you have no Email Accounts set up please skip to Step 10
Select your Email Account and click the Minus (-)
Step 5
Click Internet Accounts
Step 6
Click the Minus (-)
Step 7
Press OK
Step 8
Click Close (Red Circle)
Step 9
Click the Plus (+)
Step 10
Select Microsoft Exchange and click Continue
Step 11
Enter your Name, Email Address and click Sign in
Step 12
Click Sign in
Step 13
Enter your Password and click Sign in
Step 14 - Optional
If asked for Permissions requested, check the box "Consent on behalf of your organisation"
Step 15 - Optional
Click Accept
Step 16
Click Done to complete your account setup
You can choose what apps you want to sync with your account on this page