Changing the Message Format in Outlook
RTF-formatted messages are not supported. The procedures below describe how to change the message format, depending on your version of Outlook.
Changing the Message Format in Outlook 2010 and later
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 message
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With the message open, click Format Text.
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On the Format tab, click the format you want to use (Plain Text or HTML).
Changing the Message Format in Outlook 2007
To change the default message format for all messages
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On the Tools menu, click Options, and then click the Mail Format tab.
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In the Compose in this message format list, click HTML or Plain Text.
To change the format of an individual message
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With the message open, click Options.
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On the Format tab, click the format you want to use (Plain Text or HTML).