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ER2025's avatar
ER2025
Brass Contributor
Oct 02, 2025

Exchange Outlook Cache mode

Hi ladies and gents,

We have a requirement to set Outlook cache mode set to download 3 months of emails.

The environment consists of Exchange Online, Intune and M365 and the devices are cloud native Win 11. 

Could you please advise the best way to achieve this.  GPO is not an option, and Intune does not have a policy for this.

 

   

 

1 Reply

  • Walid_91's avatar
    Walid_91
    Copper Contributor

    Hello ER2025, 

    You can achieve this with a script powershell deployed via Intune, you just need to change a registry key and this will set the cache mode to 3 months, here is the step to do it:

     

    Here is the path and the key that needs to be modified or created if needed : 

    Registry Key to Set Cached Mode to 3 Months

    Path: HKCU\Software\Policies\Microsoft\Office\16.0\Outlook\Cached Mode

    Key: SyncWindowSettingDays

    Type: DWORD

    Value: 90 (for 3 months)

     

    Here is the Powershell script: 


    New-Item -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\Outlook\Cached Mode" -Force
    Set-ItemProperty -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\Outlook\Cached Mode" -Name "SyncWindowSettingDays" -Value 90 -Type DWord

    Make sure first to test before deploying to everyone. 

    Good luck,

    Walid

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