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Default from delegate's address in shared mailboxes in Exchange Server 2013

Symptoms
Consider the following scenario:
  • You create a shared mailbox in an environment that has Cumulative Update 3 for Microsoft Exchange Server 2013 installed.
  • You grant a delegate the Full Access permission and the Send As permission to the shared mailbox.
  • The delegate uses Microsoft Outlook to access the shared mailbox and reply to an email message.
In this scenario, the From field shows the delegate's email address instead of the shared mailbox address.
Cause
This issue occurs because the Outlook From field uses the PR_USER_ENTRYID property that is the token of the user who logs into the message store.
Resolution
To resolve this issue, install the following service pack: 
2926248 Description of Exchange Server 2013 Service Pack 1

Workaround
To work around this issue, change the From field to the shared mailbox address manually.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about shared mailboxes, go to the following Microsoft website:
Properties

Article ID: 2928748 - Last Review: 02/25/2014 21:00:00 - Revision: 1.0

Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard

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