DTOO234 - ActiveX One-Off forms must be configured.

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Information

By default, third-party ActiveX controls are not allowed to run in one-off forms in Outlook. You can change this behavior so that Safe Controls (Microsoft Forms 2.0 controls and the Outlook Recipient and Body controls) are allowed in one-off forms, or so that all ActiveX controls are allowed to run.

Solution

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security 'Allow Active X One Off Forms' to 'Enabled: Load only Outlook Controls'.

See Also

http://iasecontent.disa.mil/stigs/zip/U_MS_Outlook_2016_V1R2_STIG.zip