The demo version of Softaken Zimbra Converter will convert only 10 Emails from each Folder. Trial Version of this software is free of cost to check software features and function. If user want to convert unlimited numbers of Zimbra data into PST, EML, MSG, MBOX etc. formats than purchase license version of Softaken Zimbra Converter Software.
Try the Demo Version of the software from Softaken Official site: https://www.softaken.com/zimbra-converter