When you access your mailbox by using Outlook Web App in a Microsoft Exchange Server 2013 environment, the first email message is selected and marked as read automatically.


This issue occurs because of a by design feature in an Exchange Server 2013 environment.


To resolve this issue, install Cumulative Update 9 for Exchange Server 2013.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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