Configure Add-In Trust Level: registry value addintrustUserHKCU\software\policies\microsoft\office\16.0\outlook\security

Policy ID: L_ConfigureAddInTrustLevel
Scope: User Configuration
Supported on: At least Windows Server 2008 R2 or Windows 7
Source: Microsoft 365 Apps / Office Administrative Templates (version 5568.1000)
Category: Microsoft Outlook 2016 › Security

Registry

addintrust

REG_DWORDUser

HKCU\software\policies\microsoft\office\16.0\outlook\security Current key

Enabled value: Depends on the option value
Element: -

Options
Item	Stored value
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

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\security]

; Options (use only one)
; Trust all, or use Exchange settings if present
"addintrust"=dword:00000000
; Trust all loaded and installed COM addins
"addintrust"=dword:00000001
; Do NOT trust loaded and installed COM addins
"addintrust"=dword:00000002

CMD

:: Options (use only one)

:: Trust all, or use Exchange settings if present
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "addintrust" /t REG_DWORD /d 0 /f
:: Trust all loaded and installed COM addins
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "addintrust" /t REG_DWORD /d 1 /f
:: Do NOT trust loaded and installed COM addins
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "addintrust" /t REG_DWORD /d 2 /f

PowerShell

# Common: create the key
New-Item -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Force | Out-Null

# Options (use only one)
# Trust all, or use Exchange settings if present
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'addintrust' -PropertyType DWord -Value 0 -Force | Out-Null
# Trust all loaded and installed COM addins
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'addintrust' -PropertyType DWord -Value 1 -Force | Out-Null
# Do NOT trust loaded and installed COM addins
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'addintrust' -PropertyType DWord -Value 2 -Force | Out-Null