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Rackspace: How to add "Delegate Full Access" for User Mailboxes
The Riva connection user for Exchange requires "Delegate" full access permissions to the mailboxes of the target users.
For Rackspace customers, assigning "Delegate" full access permissions is done using the online Mailbox management management console.
For on-premise Exchange systems, this is normally configured using Exchange Management Console (see "Riva for Exchange: Understanding Full Access Permissions, Delegated Access and Impersonation").
Create a mailbox or use an existing service mailbox that Riva can use to connect to Exchange.
With hosted Exchange services, the Riva connection account should be an administrator level account that is granted "Delegate" full access permissions to each target user. Here are the steps in Rackspace: