Download and Install Advik MSG to HTML Export software on your Windows PC. Now follow the below steps to convert MSG files to HTML. Step 1. Run Advik Outlook MSG To HTML Converter in your PC. Step 2. Click Add Folder and locate folder having .msg files. Step 3. Choose output target location to save resultant file. Step 4. Click Convert to start conversion process. Finished! This is how you can export MSG to HTML file format.