Exchange 2010: Distribution Group Owner doesn’t have permissions to update list

Problem
When a distribution group owner tries to update their own group in Outlook, they recieve a message saying
changes to the public group membership cannot be saved. You do not have sufficient permission to perform this operation on this object

Solution

  1. Ensure the active directory group object has the “Owner can manage this list” option ticked
  2. Download and run this powershell script

Read This article for more help