Office Outlook 2016 . Change of appearance.

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Oct 13, 2016
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Using Win 10 I use Office Outlook 2016. Just recently the appearance (Interface?) of the message pages has changed. I now see a vertical blue line to the left of messages in the Inbox indicating that the email has not been opened. Is this the result of an update or have I clicked something in error. Any advice please?
 
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