Migration from Office 2016 H&B to Office 365

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Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange
We are in the process of migrating a number of users from Outlook 2016 home & business (using Office 365 Business Essentials) to Office 365 Business Premium.
Our internet bandwidth is not the best, and our email databases are larger, so I was hoping to keep the OST files so we don't have to re-download 8-10 GB per client when the old software is uninstalled and the new Outlook version is installed.
Will that work?
 
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