Microsoft has new tools to migrate public folders (the “cockroaches of Exchange”) to Office 365 Groups. Sounds good. The good news is that the tools work, even if they need a lot of manual oversight. ISVs offer tools to do the same job with more automation. The choice is yours!
The Office 365 Import Service does a good job of “bringing data home” by ingesting PST files and other data into Exchange Online mailboxes and SharePoint Online libraries. But sometimes you just want to do your own thing – and you can with the New-MailboxImportRequest cmdlet.