Enable indexing uncached Exchange folders: registry value PreventIndexingUncachedExchangeFoldersComputerHKLM\SOFTWARE\Policies\Microsoft\Windows\Windows Search

Policy ID: PreventIndexingUncachedExchangeFolders
Scope: Computer Configuration
Supported on: Microsoft Windows Vista, or any version of Windows with Windows Search 3.01 or later
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Search

Registry

PreventIndexingUncachedExchangeFolders

REG_DWORDComputer

HKLM\SOFTWARE\Policies\Microsoft\Windows\Windows Search Current key

Enabled value: 0
Disabled value: 1

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Windows Search]

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

CMD

:: Options (use only one)

:: Enabled
reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\Windows Search" /v "PreventIndexingUncachedExchangeFolders" /t REG_DWORD /d 0 /f
:: Disabled
reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\Windows Search" /v "PreventIndexingUncachedExchangeFolders" /t REG_DWORD /d 1 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\Windows Search' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\Windows Search' -Name 'PreventIndexingUncachedExchangeFolders' -PropertyType DWord -Value 0 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\Windows Search' -Name 'PreventIndexingUncachedExchangeFolders' -PropertyType DWord -Value 1 -Force | Out-Null