You have an Exchange Server 2003 organization that contains a server named EX_Server.
You install a server named Server1 that runs Exchange Server 2010 Service Pack 1 (SP1).
You create a public folder database on Server1.
A user named User1 has a mailbox on Server1.
User1 creates a public folder on Server1 and posts content to the public folder.
From Outlook Web App, User1 attempts to access the public folders on EX_Server and
receives and error message.
You need to ensure that User1 can access all of the public folders in the organization from
Outlook Web App.
What should you do? (Each correct answer presents a complete solution. Choose all that
apply.)

A.
From Exchange System Manager on EX_Server, modify the replica list of the public
folders.

B.
From the Exchange Management Console (EMC), modify the properties of the Outlook
Web App mailbox policy.

C.
Instruct User1 to use Outlook Web Access (OWA).

D.
From the Exchange Management Shell, run the addreplicatopfrecursive.ps1 script.

E.
From the Exchange Management Console (EMC), modify the default public folder
database of the mailbox database.

Explanation:
This question is actually about replication. Once the public folders on EX_Server are
replicated to Server1, User1 will be able to access them.

http://technet.microsoft.com/en-us/library/dd335168.aspx
http://blogs.technet.com/b/agobbi/archive/2010/08/04/how-to-move-public-folder-fromexchange-2003-toexchagne-2010.aspx