Permissions Requirements

On-Premises And Hosted Exchange

The out-of-office sender list for each mailbox is reset by the Out-of-Office Extender Service, which communicates with Exchange using an account that has been assigned to the Application Impersonation role; this is referred to as the impersonation account. The details of your Exchange environment, together with the details of the impersonation account, are specified in the Environment Configuration dialog.

How the impersonation account is created will depend on your Exchange environment:

•On-Premises Exchange Server

•Hosted Exchange

Office 365

When resetting the out-of-office sender list for mailboxes hosted on Office 365, the Out-of-Office Extender Service uses an app registered in your Entra ID, which is configured in Environment Configuration dialog. More details about configuring mailbox access in Office can be found here.