Certain users in the organization where not able to edit (add / remove ) users from a Distribution group in the GAL.
This was the error they say in the Outlook.
“Changes to the public group membership cannot be saved …”
Nevertheless the user itself had Ownership ?
After Googling a bit, it seems that this is a dafault behavior of Exchange 2010 and higher.
So you need to change the Roles & Policies that are connected to the users, using the web ECP.
In order to allow the editing of the a Distribution Group from within Outlook.
Also the Membership Approval settings must be correct.
Next check the security settings via the ADUC on this Distribution Group Object. Make sure that this user has sufficient control.
Some more interesting readings are over here :
You can of course use PowerShell to manage the Distribution Groups
Using : Get-ManagementRole cmdlet
“get-managementrole MyDistributionGroupMembership | get-member”