The problem is that the Microsoft Outlook policy does not take effect on all the domain computers. Do you have a suggestion on how to solve this?
If you want all users within the Organizational Unit to receive this policy setting, select the Everyone group or the Authenticated Users group, and it should work fine. You can be more restrictive/granular if you don't want to use those broad security groups.
Also, make certain that there is no other policy in place that defines the use of the preview pane or might override the policy you are trying to configure.
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