Do not include the Online Archive in All Mail Item search: registry value disableonlinearchiveinupscopedsearchbydefaultUserHKCU\software\policies\microsoft\office\16.0\outlook\search

Policy ID: L_DoNotIncludeTheOnlineArchiveInAllMailItemSearch
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 › Outlook Options › Preferences › Search Options

Registry

disableonlinearchiveinupscopedsearchbydefault

REG_DWORDUser

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

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

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

; Options (use only one)
; Enabled
"disableonlinearchiveinupscopedsearchbydefault"=dword:00000001
; Disabled
"disableonlinearchiveinupscopedsearchbydefault"=dword:00000000

CMD

:: Options (use only one)

:: Enabled
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\search" /v "disableonlinearchiveinupscopedsearchbydefault" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\search" /v "disableonlinearchiveinupscopedsearchbydefault" /t REG_DWORD /d 0 /f

PowerShell

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

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\search' -Name 'disableonlinearchiveinupscopedsearchbydefault' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\search' -Name 'disableonlinearchiveinupscopedsearchbydefault' -PropertyType DWord -Value 0 -Force | Out-Null