prvent outlook users from modifying distribution group memberships?

Management has requested that we prevent Outlook users from having the ability to add/remove members to distribution groups/security groups.

Here's what I've done so far, but haven't had alot of luck in getting the desired results.  I open up the Security group in question in ADUC.  Go to the MANAGED BY tab and specify the account that I want to manage the group.  Then I checked MANAGER CAN UPDATE MEMBERSHIP LIST.  I was hoping this alone would be all that I needed, although it doesn't seem to do it.  Here's a little info about the setup:

Windows 2003 AD
Windows 2003 server running Exchange 2003
Outlook 2007

Thanks in advance for your help.
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"Go to the MANAGED BY tab and specify the account that I want to manage the group.  Then I checked MANAGER CAN UPDATE MEMBERSHIP LIST. "

To prevent Modification you should "UNCHECK" it not Check it :) Also remove anybody who is listed Under "Managed By"

RTCAAuthor Commented:
Like you recommended, the distribution groups management were blank at first, which is why I made the changes I listed .  There were no accounts specified and the "manager can update membership list" was unchecked.  With those parameters, anybody in the company could modify the membership of that group via Outlook.  
Well in this the only thing that comes to mind is that it is inheriting permissions from a parent or Administrative Control has been delegated to user. Please check Security Inheritance and Delegations.


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RTCAAuthor Commented:
Expanding my test, I think I agree 100% in that its now a permission issue on a user level, instead of the group itself.  There are some users that cannot modify dist group membership regardless of the parameters set in the manager.  I think there is some clean up to do elsewhere.  
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