Trying to export a document which contains hyperlink pasted from Outlook throws KeyNotFoundException. The color of the span is not registered. Workaround: Telerik.WinForms.Documents.Model.Styles.StyleDefinition style = new Telerik.WinForms.Documents.Model.Styles.StyleDefinition("test", Telerik.WinForms.Documents.Model.Styles.StyleType.Character); style.SpanProperties.ForeColor = Color.FromArgb(5,99,193); this.radRichTextEditor1.Document.StyleRepository.Add(style);