Set "Encrypt data between Microsoft..." by registry setting or pol

[Midwest Muskie]

I am wanting to control the Encrypt data between Microsoft Office Outlook and
Microsoft Exchange" setting under the account Security tab by policy or a
registry setting. I have not been able to find anywhere under the Outlook
2007 Group Policy Template that seems to apply. Am I missing something. If
it can't be controlled by policy can I roll out a registry hack that changes
the setting?

Thanks for your help.

Mike