double click the email to open it
click FILE, then the properties button
or do you mean the tiny little arrow just to the right of the word TAGS (Outlook 2010 and 2013)
you need to double click a message before either of these options are available
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If you do not want to open the message first, but want to access the Message Options dialog directly from within the main Outlook window, then you can add the Message Options command to your Quick Access Toolbar;
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File-> Options
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Select the Quick Access Toolbar on the left.
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Set the Choose commands from dropdown list to; Commands Not in the Ribbon
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From the command list select; Message Options
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Press the Add > > button.
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Press OK.
The option is now added to the Quick Access Toolbar at the top of your Outlook window and view the Internet headers of a message without needing to open it first.
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Edited by
Knob Country
15 hours 40 minutes ago
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Proposed as answer by
Knob Country
15 hours 20 minutes ago
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Unproposed as answer by
Knob Country
14 hours 53 minutes ago