Formatting, pictures, and links can be turned off for all messages that you open in Outlook.
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Click the File tab.
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Click Options.
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Click Trust Center, and then click Trust Center Settings.
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Click Email Security.
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Under Read as Plain Text, select the Read all standard mail in plain text check box.
To include messages signed with a digital signature, select the Read all digitally signed mail in plain text check box.
 
Note: If you want to view a plain text message in its original format, click the InfoBar, and choose Display as HTML.