Follow-up the given steps & in seconds have all your EML files converted into.tgz format
Download & Install the software's .exe file
After that Launch it in your machine from: Start >> Programs >> EML to Zimbra Converter >> EML to Zimbra Converter
Click on Add Folder Having eml/emlx files – You must have all EML files saved in 1 folder, so that you can select the folder & convert it.
Click on Start Conversion button, in doing so you will be asked to choose a location to save the .tgz file after conversion
When conversion is over you will get a completion messages. Now you can go the chosen saving location to view your .tgz file.