public async Task <List <SalesOrder> > GetSalesOrdersAsync()
        {
            var folderId = Settings.Default.SalesOrderFolderId;

            var allMail = await Task.Factory.StartNew(() => MailProvider.GetMail(folderId));

            var salesOrders = new List <SalesOrder>(allMail.Count);

            foreach (var mail in allMail)
            {
                var salesOrder = await GenerateSalesOrderFromMail(mail);

                salesOrders.Add(salesOrder);
            }

            return(salesOrders);
        }