Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....Mapi.MapiMessage.AddCustomProperty(Aspose.Email.Mapi.MapiPropertyType...String) Method Aspose.Email.Mapi.MapiMessage.GetCustomProperties...