Yesterday we announced the availability of public folder migration from Exchange Server 2013/2016 on-premises to Exchange Online!
The Key requirements are,
- Exchange Server 2013 CU15 (or later), Exchange Server 2016 CU4 (or later)
- Exchange on-premises hybrid configured with Exchange Online
So make sure to follow the respective article suitable to you:
- Use batch migration to migrate Exchange 2013 public folders to Exchange Online
- Use batch migration to migrate Exchange 2016 public folders to Exchange Online
Hope this helps.