Default message format must be set to use Plain Text.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-26634	DTOO314 - Outlook	SV-34105r1_rule		Medium

Description
Outlook uses HTML as the default e-mail format, but users can choose a format other than the default when composing messages. This setting controls the default message format in Outlook.

STIG	Date
Microsoft Outlook 2010 STIG	2018-04-04

Details

Check Text ( C-34230r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Outlook Options -> Mail Format -> Internet Formatting -> Message Format “Set message format” must be “Enabled: Plain Text". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\outlook\options\mail Criteria: If the value EditorPreference is REG_DWORD = 65536 (dec), this is not a finding.

Check Text ( C-34230r1_chk )

The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Outlook Options -> Mail Format -> Internet Formatting -> Message Format “Set message format” must be “Enabled: Plain Text".

Procedure: Use the Windows Registry Editor to navigate to the following key:

HKCU\Software\Policies\Microsoft\Office\14.0\outlook\options\mail

Criteria: If the value EditorPreference is REG_DWORD = 65536 (dec), this is not a finding.

Fix Text (F-29920r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Outlook Options -> Mail Format -> Internet Formatting -> Message Format “Set message format” to “Enabled: Plain Text".