Changing the Message Format in Outlook
The procedures below describe how to change the message format, depending on your version of Outlook.
To change the message format for all messages
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Click the File tab.
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Click Options.
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Click Mail.
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Under Compose messages, in the Compose messages in this format list, click HTML or Plain Text.
To change the format of an individual outgoing message
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With the message open, on the main menu, click Format Text.
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On the Format tab, click the format you want to use (Plain Text or HTML).