Public Folders have been a part of Exchange environments for years, helping organizations share emails, contacts, calendars, and other information across teams. However, as businesses move their infrastructure to Microsoft 365, migrating Public Folders can become a challenging part of the overall Exchange migration process.
A successful Public Folder migration requires proper planning, preparation of the source and target environments, and careful management of large folder hierarchies and permissions.
At eDigital Networks, we work with businesses that are cleaning up their IT infrastructure before or during a move to the cloud. Public Folders come up in almost every one of these conversations. This guide explains how to migrate Public Folders to Microsoft 365 and explores the options available to simplify the process.
What Are Public Folders in Microsoft 365?
Public Folders provide a shared location where users can store and access information such as emails, contacts, calendars, and documents. They are commonly used for departmental communication, shared mailboxes, or archiving information that multiple users need to access.
In Microsoft 365, Public Folders can continue to be used in Exchange Online. Organizations migrating from an on-premises Exchange Server need to move their existing Public Folder hierarchy and content to
Methods to Migrate Public Folders to Microsoft 365
There are different ways to migrate Public Folders, depending on your Exchange environment, migration requirements, and the amount of data involved.
Method 1: Use Microsoft’s Native Public Folder Migration
Microsoft provides native procedures and PowerShell scripts for migrating Public Folders from supported Exchange Server environments to Exchange Online.
The process generally involves the following stages:
- Prepare the source Public Folder environment. Ensure the Public Folder databases are healthy and meet the requirements for migration.
- Create a migration batch. Configure the migration process to move Public Folder data from the on-premises Exchange environment to Microsoft 365.
- Synchronize the Public Folder hierarchy and content. The migration process copies the folder structure and data to Exchange Online.
- Lock the source Public Folders. Before the final synchronization, users are prevented from making changes to the source Public Folders.
- Complete the migration and switch users to Microsoft 365. After the final synchronization is complete, users can access the migrated Public Folders in Exchange Online.
The native method can work well for organizations with a supported and properly configured Exchange environment. However, the process may require PowerShell expertise and careful management of migration scripts, permissions, and synchronization.
Method 2: Use a Public Folder Migration Tool
Migrating Public Folders to Microsoft 365 can be complex when dealing with large volumes of data, multiple folders, and permissions. In such cases, using a dedicated Exchange migration tool can simplify the process.
Well-known migration solutions include Stellar Migrator for Exchange, CodeTwo, BitTitan MigrationWiz, and Quest On Demand Migration. These tools can provide a more streamlined approach for organizations that want to reduce manual steps and simplify large-scale migrations.
For example, an Exchange migration solution can help migrate Public Folder data while providing greater control over the migration process. This can be useful when managing complex folder structures or planning a migration with minimal disruption to users.
Final Thoughts
Migrating Public Folders to Microsoft 365 requires careful planning, especially when the environment contains a large number of folders, significant amounts of data, or complex permissions. Organizations can use Microsoft’s native migration tools for supported environments or choose a dedicated migration solution to simplify the process.
Before starting the migration, assess your existing Public Folder environment, clean up unnecessary data, test the migration process, and verify the results after the move. A well-planned approach can help minimize disruption and ensure users can continue accessing the shared information they need in Microsoft 365.
Frequently Asked Questions
Can Public Folders be migrated to Microsoft 365?
Yes. Public Folders hosted in supported Exchange Server environments can be migrated to Exchange Online in Microsoft 365. The migration can be performed using Microsoft’s native tools or a third-party migration solution.
How long does a Public Folder migration take?
The migration time depends on the size of the Public Folder data, the number of folders, network speed, and the complexity of the environment. Large migrations may require several synchronization cycles before the final cutover.
Will Public Folder permissions migrate to Microsoft 365?
Permissions can be migrated, but organizations should review and test them after migration. Complex or outdated permission configurations may require additional attention.
Can users access Public Folders during the migration?
Users may be able to access Public Folders during the initial synchronization phase. However, access or changes to the source environment may need to be restricted during the final cutover to ensure all data is successfully synchronized.