private void RemoveReadyRedlineCategory(MailItem mailitem)
		{
			if (mailitem.Categories == null)
				return;
			// Remove the redline category, from any possible position in the (comma separated) string
			var csv = new System.Configuration.CommaDelimitedStringCollection();
			csv.AddRange(mailitem.Categories.Split(','));
			csv.Remove(Interop.Options.OptionApi.GetString("ReadyRedlineCategoryName"));
			mailitem.Categories = csv.ToString() ?? string.Empty;
		}