Email that you send on behalf of someone is not saved in their Sent Items folder

Consider the following scenario. You use Outlook 2010 and are a delegate for your manager. Even though the DelegateSentItemsStyle registry value is set to 1, an email message that you send on behalf of your manager is saved in your Sent Items folder.

Key: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
Name: DelegateSentItemsStyle
Type: DWORD
Value: 1

In earlier versions of Outlook, the same registry value forces the email message to be saved in the Sent Items folder of the person on whose behalf the message was sent.

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To resolve this problem, install the hotfix that is described in the following Microsoft Knowledge Base article:

2459115 Description of the Outlook 2010 hotfix package (outlook-x-none.msp): December 14, 2010

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:

http://office.microsoft.com/en-us/outlook-help/turn-on-or-off-cached-exchange-mode-HP010355560.aspx

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The following articles describe this feature in earlier versions of Outlook.

959628 Description of the Outlook 2003 hotfix package (Outlook.msp): December 16, 2008
http://support.microsoft.com/default.aspx?scid=kb;EN-US;959628

972148 When you send an e-mail message from a shared mailbox in Outlook 2007, the sent message is not saved in the Sent Items folder of the shared mailbox
http://support.microsoft.com/default.aspx?scid=kb;EN-US;972148

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