Prerequisites for the Exchange Mailbox Agent User Mailbox Hybrid Environment

Before you install the Exchange package, make sure that your on-premises environment meets the prerequisites.

Assigning Permissions to On-Premises Service Accounts

• Microsoft Outlook requirements

• Assign full access to service accounts

  The service account must have full access rights to all the mailboxes on the server.

• If you locate the agent on an off-host access node, the service account must be in the Local Administrator Group on the access node server.

• Disabling the throttling policy

• Disabling MAPI Over HTTP

Assigning Permissions to Online Service Accounts

If you are using basic authentication, you must perform the following prerequisite tasks:

• Port Requirements

• Configuring Support for Office 365 with Exchange in China or Germany

• Provide the service accounts access to the mailboxes

If you are using modern authentication, you must perform the following prerequisite tasks:

• Port Requirements

• Configuring Support for Office 365 with Exchange in China or Germany

• Register the Application for Modern Authentication

• When you upgrade to Feature Release 20, if you move from basic authentication to modern authentication and you are using a manually created app, you must have the Group.Write.All permission under Microsoft Graph and the full_access_as_app permission under Under Supported Legacy API in the Azure portal.