Friday, January 18, 2019

 As far as I know there may not a special exchange 2010 group which you added you will get full access permission on all mailboxes.


 You can use this command to grant user full access  permission on the database:


 Get-MailboxDatabase| Add-ADPermission –user Administrator –AccessRights GenericAll


  After that Administrator will have full access to all mailboxes in the databases. This even applies to new accounts created after you run the cmdlet.