Office365 Outlook Cached Mode – Sync Setting GPO not adjusting GUI

As part of setting up Outlook/Office365 within a Citrix Environment

When setting the following GPO Setting:

USER – Administartive Templates\Microsoft Outlook 2016\Account Settings\Exchange\Cache Exchange Mode


The below is the effect on Offline settings in the GUI, which is not reflective of the GPO setting



A bit of research later, this appears to be a bug in the GUI and the actual setting can be validated in the Registry in the below key

HKCU\Software\Policies\Microsoft\Office\16.0\Outlook\Cached Mode –


Value Name: Synwindowsettingsdays

Value Data: 3 (which indicates 3 days as per the GPO)



  1. Hello Mate,

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    This can be done with Windows API calls. It’s a bit of a complicated process, but it can be done. Here’s what you would do, in simple terms: Automation anywhere training USA

    1. Use the AutomationElement functions to find the window of interest, by name. Start with the desktop, then find the Xpedition window, then the sub-windows within the Xpedition window.

    2. Get the handle of the object of interest, in this case a sub-window inside the Xpedition window.

    3. Use the handle and the Graphics tools in to get a bitmap image of the window you want.
    Very useful article, if I run into challenges along the way, I will share them here.

    Irene Hynes

  2. Hi Dave, I am seeing this issue only recently, it was showing correctly when set to 3months but now just shows All dispite the Registry settings appearing correctly I am seeing all Mail in my OST as being cached.

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