If you don't want to use the Microsoft login information, which is required by the express configuration option, you can use the custom configuration option.
Before using the custom configuration, you must register the Azure app for Exchange Online with Azure AD. A service account is required only when you want to back up and restore all public folders.
You can either perform the app registration manually or you can use the configuration helper tool to automate the app registration.
Procedure
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Register the Azure app by using one of the below options: