Microsoft makes it easy for companies to use Office 365 and has been very successful in moving customers to the cloud. But when you get to the cloud and find that your company is involved in a corporate merger, acquisition, or split, things are not so easy because the tools to do the work don’t exist. Some glimmer of hope exists as ISVs have started to take interest in the space.
Microsoft now supports the migration of modern public folders to Exchange Online. ISV solutions allow you to migrate public folders to other places, like Office 365 Groups and shared mailboxes, which seems like a lot more interesting.