Outlook Rich Text options must be set for converting to plain text format.

From Microsoft Outlook 2010

Part of DTOO344 - Outlook Rich Text options

SV-34103r1_rule Outlook Rich Text options must be set for converting to plain text format.

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Outlook automatically converts RTF formatted messages that are sent over the Internet to HTML format, so that the message formatting is maintained and attachments are received.This setting controls how Outlook sends Rich Text Format (RTF) messages to Internet recipients.

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Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Outlook Options -> Mail Format -> Internet Formatting “Outlook Rich Text options” to “Enabled: Convert to Plain Text format".

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