Configure Add-In Trust Level
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook\security Options
addintrust enum - Trust all, or use Exchange settings if present
->
0 - Trust all loaded and installed COM addins
->
1 - Do NOT trust loaded and installed COM addins
->
2
Description
All installed trusted COM addins can be trusted. Exchange Settings for the addins still override if present and this option is selected.