Assign the correct permissions to servers that are used for Case Manager.
Procedure
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From the navigation pane, go to Protect > Applications > Exchange. The Exchange page appears. 
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Click the Exchange user mailbox, journal mailbox, or SMTP servers where the custodian data is backed up. The properties page appears. 
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On the Configuration tab, in the Security section, click Edit. The Security dialog box appears. 
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On the Associations tab, enter the Case Manager user, select the Case Manager User role, and then click Add. 
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Click Save.