Remove Exchange 2003 after transition to 2007   

I managed to go forward in this up to the clean up point where it asked to 
run a cmdlt to clear some permission which is in raw format 
Remove-ADPermission "dc=<Domain>" -user "<RootDomain>\Exchange Servers" 
-AccessRights WriteDACL -InheritedObjectType Group
can someone give me an example
Thanks

date: Thu, 29 May 2008 07:51:00 -0700   author:   Magic