Hi @lee roberts
Agree with Andy, the easiest method to do this should be:
- create new shared mailboxes on O365
- use Outlook to export the items in the public folders to PST files
- use Outlook to import the PST files into the shared mailboxes
Below are links of the Outlook export/import process:
Export:Back up your email
Import:Import email, contacts, and calendar from an Outlook .pst file
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