First of all I would like to suggest you this Amazon Workmail Tool. You need not to find AWS workmail migration tool, as this tool is an all in one application. You can export Amazon Workmail email to Office 365, Gmail, G Suite, Yahoo Mail, GoDaddy, Windows Live Mail, Outlook.com etc accounts. Also you can export emails from Amazon Workmail to PST, PDF, EML, EMLX, MSG, DOC, TXT etc file formats also by using the most secure and reliable third party software, Amazon WorkMail to Office 365. Its free demo version is also available, which allows its user to migrate migrate 10 items/per folder free from Amazon WorkMail to Office 365. Save Migration Summary:- This tool allows you to save migration summary in CSV file after migration. It has all the details like destination, source, migration status, and folder type. You can also analyze details easily.
Free trial version available:- You should try free version of Export Amazon WorkMail to Office 365 to perform migration from Amazon WorkMail to Office 365. With this version you can get to know the features of this tool. It allows you to migrate only 10 items per folder for free.