public static MailGroup GetMailGroup(int itemId)
        {
            // load meta item
            MailGroup item = (MailGroup)PackageController.GetPackageItem(itemId);

            // load service item
            MailServer mail = new MailServer();
            ServiceProviderProxy.Init(mail, item.ServiceId);
            MailGroup group = mail.GetGroup(item.Name);

            // add common properties
            group.Id = item.Id;
            group.PackageId = item.PackageId;
            group.ServiceId = item.ServiceId;

            return group;
        }