that do not need to access Public Folders. I deliberately say “user mailboxes” in this context, you can still have mailboxes in Exchange on-premises for applications, service accounts, devices etc. You should only migrate Public Folder to Exchange Online, after you have migrated all user mailboxes to Exchange Online. So, mailboxes in Exchange on-premises cannot access Public Folders in Exchange Online. Mailboxes in Exchange Online can access Public Folders in Exchange on-premises, but not the other way around. Public Folder access cross-premises is one-way only. When migration Public Folder from Exchange 2016 to Exchange Online, take your time and do it right! When to migrate your Public Folders to Exchange Online It has also been a long project, preparations took a couple of weeks, the synchronization a couple of days, roll-back after the first attempt to finalize the migration and start over again with fixing the unexpected issues. If you are still running Exchange 2010 and you want to move your (legacy) Public Folders to Exchange Online, follow the steps in this Microsoft article: Use batch migration to migrate legacy public folders to Microsoft 365 or Office 365. This blog explains steps to migrate Modern Public Folders from Exchange 2016 to Exchange Online, but this blog is also valid for modern Public Folders in Exchange 2013 and Exchange 2019. Not a lot of customers still have Public Folders in Exchange on-premises, but they are still there. Many customers are running in an Exchange hybrid environment where they have mailboxes in Exchange Online and in Exchange on-premises and a lot of my customers have Exchange 2016 running on-premises.
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