Accounts and Passwords, and select your Exchange account.
You can also set up automatic out-of-office replies, and change how often you want Mail to sync.
If you select Sign In, your email address is sent to Microsoft to discover your Exchange account information.
If your account uses multi-factor authentication, you'll be guided through a custom authentication workflow. If you need help, contact your Exchange Server administrator.
There are many other historic causes of issues with installing, running, and connecting to WMDC which could still be encountered, such as are described at the following web pages.