Outlook Security Mode: registry value adminsecuritymodeUserHKCU\software\policies\microsoft\office\16.0\outlook\security

Policy ID: L_OutlookSecurityMode
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 › Security Form Settings

Registry

adminsecuritymode

REG_DWORDUser

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

Enabled value: Depends on the option value
Element: Outlook Security Policy:

Options
Item	Stored value
Outlook Default Security	0
Use Security Form from 'Outlook Security Settings' Public Folder	1
Use Security Form from 'Outlook 10 Security Settings' Public Folder	2
Use Outlook Security Group Policy	3

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)
; Outlook Default Security
"adminsecuritymode"=dword:00000000
; Use Security Form from 'Outlook Security Settings' Public Folder
"adminsecuritymode"=dword:00000001
; Use Security Form from 'Outlook 10 Security Settings' Public Folder
"adminsecuritymode"=dword:00000002
; Use Outlook Security Group Policy
"adminsecuritymode"=dword:00000003

CMD

:: Options (use only one)

:: Outlook Default Security
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "adminsecuritymode" /t REG_DWORD /d 0 /f
:: Use Security Form from 'Outlook Security Settings' Public Folder
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "adminsecuritymode" /t REG_DWORD /d 1 /f
:: Use Security Form from 'Outlook 10 Security Settings' Public Folder
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "adminsecuritymode" /t REG_DWORD /d 2 /f
:: Use Outlook Security Group Policy
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\security" /v "adminsecuritymode" /t REG_DWORD /d 3 /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)
# Outlook Default Security
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'adminsecuritymode' -PropertyType DWord -Value 0 -Force | Out-Null
# Use Security Form from 'Outlook Security Settings' Public Folder
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'adminsecuritymode' -PropertyType DWord -Value 1 -Force | Out-Null
# Use Security Form from 'Outlook 10 Security Settings' Public Folder
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'adminsecuritymode' -PropertyType DWord -Value 2 -Force | Out-Null
# Use Outlook Security Group Policy
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\security' -Name 'adminsecuritymode' -PropertyType DWord -Value 3 -Force | Out-Null