The Configure Mailbox Access page of the Configure Office 365 Mailbox Access Wizard allows you to choose how to configure the registered app that will be used by Email Signature Manager to access mailboxes hosted in Exchange Online.
There are three options available:
•Automatically register and configure an Entra ID app: Choose this option if you have not previously registered an app for Email Signature Manager and wish to let the wizard automatically configure it; this process will require granting permissions to the Symprex Application Setup app.
•Renew the certificate for an existing Entra ID application: Choose this option if you have previous automatically created the registered app for Email Signature Manager and wish to renew the certificate it is using for authentication.
•Use an existing Entra ID application: Choose this option if you have manually registered an app in the Azure portal and wish to configure Email Signature Manager to use it.
When you are ready, click the Next button to proceed to either the Create Registered App page, Manage Registered App page or Existing Registered App page (depending on the option you have selected) or the Cancel button to close the wizard.