How Do I Migrate Public Folders from Exchange 2003 to Exchange Server 2010?

[Xavier Mustin]

• 
  Moving all Public Folder replicas using the Exchange 2003 System Manager console
• Moving all Public Folder replicas using the Exchange 2010 Management Shell

Either method will work in just about any scenario, it just comes down to which one you’re most comfortable using.
Moving all Public Folder Replicas to Exchange Server 2010 Using the Exchange 2003 System Manager Console

In this example scenario the public folders hosted on the Head Office Exchange 2003 server are being moved to the Head Office Exchange 2010 Mailbox server.
As with mailbox migrations public folder migrations can generate heavy disk I/O on the source server, and will generate a lot of transaction logging that consumes free disk space on the target server.
On an Exchange 2003 server open Exchange System Manager. Navigate to the server that currently hosts the public folder replicas, and browse to the public folder Instances folder of the public folder database.
Note the public folder instances currently on this server.

Public Folder Instances shown in the Exchange 2003 System Manager console​

Right-click the public folder database and choose Move All Replicas.

Move all Public Folder Replicas​

Choose the public folder database to move the replicas to.

Choose the database to move the Public Folder replicas to​

A warning appears that the move may take a lot of time depending on the amount of public folder content to be moved. Click OK to begin.

Note that moving Public Folder replicas can take some time​

You can refresh the public folder instances folder to monitor progress. This operation can take some time, even for a small amount of public folder content. When the public folder instances displays an empty list the operation has completed.

All public folder replicas have been moved​

Moving all Public Folder Replicas to Exchange Server 2010 Using the Exchange Management Shell

Public folder replicas can also be moved using the Exchange Management Shell. In this example the public folders hosted on the Branch Office Exchange 2003 server will be moved to the Branch Office Exchange 2010 Mailbox server.
On the Exchange 2010 server open the Exchange Management Shell. Navigate to the scripts folder of the Exchange installation folder.
[PS] C:\>cd $env:exchangeinstallpath\scripts
Microsoft has supplied a PowerShell script called MoveAllReplicas.ps1 for moving public folder replicas. Run the script with the following parameters:

• -Server is the name of the Exchange 2003 server
• -NewServer is the name of the Exchange 2010 server

Note that this is a single-line command run from the folder containing the scripts.
[PS] C:\Program Files\Microsoft\Exchange Server\V14\scripts>.\MoveAllReplicas.ps1 -Server ESP-BR-DC -NewServer ESP-BR-EX2010
You can use the same method as with the Exchange System Manager console technique to determine when all replicas have been moved.