Office365 Outlook Cached Mode – Sync Setting GPO not adjusting GUI

Wilky.IT - Desktop Virtualisation Blog

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

When setting the following GPO Setting:

USER – Administartive TemplatesMicrosoft Outlook 2016Account SettingsExchangeCache 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

HKCUSoftwarePoliciesMicrosoftOffice16.0OutlookCached Mode –


Value Name: Synwindowsettingsdays

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


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