Hi Neemobeer , In our case, our user mailboxes are done by third-party consultants and they are paid to get that project completed.
For data migration to OneDrive and SharePoint is a different deal. We cannot have the consultants do it as we cannot abide by a certain time frame and the bill would be very expensive for them if we prolong the project. We will need to work with different departments and different users to manage the data migration. Thus, we need to do it ourselves.