Group Manager in Exchange 2010-2013 are unable to manage group membership.

There was a change in RBAC. Group managers are not able to add or remove members of a distribution Group even if it seems so in the Exchange Management Console.

The only options in ECP was to give them the additional permission to great and remove groups. You can create a new role that will enable this permission again. Thanks to Matthew Byrd at Microsoft who has created a Powershell script that does this for us.

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