Article ID: 2843677 - View products that this article applies to.
Assume that you're using Microsoft Outlook 2010 in Office 365, and you've been delegated permission to send email messages on behalf of another user from a shared mailbox. However, when you send a message on behalf of the user, the sent message isn't saved to the Sent Items folder of the shared mailbox. Instead, it's saved to the Sent Items folder of your mailbox.
In Office 365, shared mailboxes don't require a license and can't be added to Outlook 2010 as an independent mailbox. You can't sign in to a shared mailbox. Instead, you sign in to your own mailbox and then open the shared mailbox. When you send or reply to a new message from the shared mailbox, Outlook automatically sends or replies from the sender's account. Therefore, messages are stored in the Sent Items folder of the sender's mailbox.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756To work around this issue, add and enable the DelegateSentItemsStyle registry entry. This forces Outlook to store messages in the Sent Items folder of that same shared mailbox when the messages are sent from a shared mailbox. To do this, follow these steps:
(https://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
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Article ID: 2843677 - Last Review: July 9, 2014 - Revision: 6.0