The quickest, easiest and safest way to remove the Properties tab is to switch the delivery location of mail from the Exchange server to a personal folder. However, this configuration is usually considered a problem and not a solution.
I do not know of an easy way to hide the Permissions tab for all mailbox folders. The GPO templates included with the Office Resource Kit do offer a variety of policy settings that help administrators control Outlook client settings. However, hiding the Permissions tab is not one of them.
Now, I make no guarantees about this. But, in theory, you could use a tool like Regmon to help you identify the Object Class ID for the Permission tab used for delegation in Outlook, and change the default permission on that. If you do decide to try this, please back up the registry first.
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