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Outlook.MailItem mail = Application.ActiveExplorer().Selection[1] as Outlook.MailItem mail.PropertyAccessor.SetProperty("http://schemas.microsoft.com/mapi/proptag/0x10800003", 1); mail.FormDescription.Icon = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"ToolbarIcons\setup.ico"); mail.FormDescription.MiniIcon = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"ToolbarIcons\setup.ico"); mail.Save(); //refresh item for display