Before proceeding steps for EML to Zimbra TGZ Conversion, I recommend downloading the demo edition of the software from the below button.
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Win 10 & all below version
First Step: Open eSoftTools EML to Zimbra Converter software
Second Step: click on "Add EML Folder" from software toolbar OR from File menu to select folder having EML files.
Once selected your EML folder location, the software detected only *.eml files and list you as above screenshot.
Note: Software also load all sub-folders of EML files for conversion.
Third Step: The next step is to click on the "SAVE" button from the software toolbar OR from File menu and choose the location where you want to save the converted Zimbra TGZ file.
Once the conversion finished, the software shows you confirmation message like below-