The Add-In Trust Level must be configured.

From Microsoft Outlook 2013 STIG

SV-53919r1_rule The Add-In Trust Level must be configured.

Vulnerability discussion

Under normal circumstances the installed COM add-ins are applications that have been approved and intentionally deployed by the organization and therefore they should not pose a security threat. However, if malware has infected systems it is possible that the malware will use the COM add-in feature to perform unauthorized actions. This setting enforces the default configuration, and therefore is unlikely to cause significant usability issues for most users.

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Fix text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security "Configure Add-In Trust Level" to "Enabled (Trust all loaded and installed COM addins)".

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