Symptoms
Consider the following scenario:
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You receive an email message in a Microsoft Exchange Server 2010 Service Pack 1 (SP1) or a later version environment.
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The sender requests a read receipt.
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You move this email message to a personal folder file (.pst) or you move the message to another folder in the mailbox.
In this scenario, the following Non-Read Notification (NRN) is sent unexpectedly to the sender:
Cause
This issue occurs because a flag that causes the NRN is set incorrectly when you move the email message to a personal folder file.
Resolution
To resolve this issue, install the following update rollup:
2579150 Description of Update Rollup 4 for Exchange Server 2010 Service Pack 1
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
