http://support.microsoft.com/kb/2181579

Important  After you install the December hotfix package for Outlook 2010 and set the DelegateSentItemsStyle registry value to 1, the functionality is available only when the Exchange account is set to Use Cached Exchange Mode. The DelegateSentItemsStyle registry value does not affect an Exchange account that is configured in Online mode. For more information about enabling Use Cached Exchange Mode, see the following article in the Microsoft Knowledge Base:


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