Problem: Tried to remove a user from an Exchange 2010 server using the EMC and got an error that this procedure was denied because I did not have the rights to or to be more specific, insufficient rights. The account was disabled so I re-enabled it and that didn’t work.
Solution: Went into Active Directory Users and Computers, found the user, right clicked and selected properties. I then went to the security tab and clicked advanced. I clicked on “Enable Inheritance” and clicked OK. Went back into EMC and was able to remove the user.