User Configuration > Administrative Templates > Microsoft Outlook 2016 > Account Settings > Exchange > Cached Exchange Mode
User
HKCU\software\policies\microsoft\office\16.0\outlook\cached mode
Checked: Checks the "Download Public Folder Favorites" option in the Advanced tab of the Microsoft Exchange Server dialog box (More Settings button in the E-mail Accounts dialog box) and enables the option. This enables Public Folder Favorites synchronization in Cached Exchange mode. | Unchecked: Unchecks the "Download Public Folder Favorites" option in the Advanced tab of the Microsoft Exchange Server dialog box (More Settings button in the E-mail Accounts dialog box) and disables the option. This disables Public Folder Favorites synchronization in Cached Exchange mode.