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...."Subject" ; // Set some HTML text in the HTML body msgInterop . HTMLBody...HTMLBody = "<h3>HTML Heading 3</h3> <u>This is underlined text</u>"...