Exchage 2003-2007 migration--Free Busy not working.

We are in the process of migrating from Exchange 2003 to Exchange 2007.  All users have been migrated.  This morning, I replicated, then moved all of the public folders over to Exchange 2007.  After moving the public folders, I dismounted the Public folder store on the old Exchange 2003 server.   Now, users are unable to see the free/busy informtion when they try to schedule appointments.  After discovering that employees were no longer able to see the free/busy information, I turned the Exchange 2003 public store back on, but I am unable to get the data replicated back to the Exchange 2003 Public Folder store.  Also, I should mention that all of the clients are still on Outlook 2003.  Due to budget constraints, there are no plans to upgrade the clients until at least next year.  Will I need to keep the old server running to accommodate Outlook 2003?  How can I get the free/busy information back?
ExpertAssistAsked:
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ExpertAssistAuthor Commented:

I ran the following script for the Exchange 2003 server, but receive a message that "<server> \Public Folder"was not found.  When I try to list the Public Folder for Exchange 2003, I receive a message The server <server> is running Microsoft Exchange 2003 or earlier.?  When I look at the Exchange System Manager on the Public Folder Store Properties, I see the Associated public folder tree is First Administratifve Group/Public Folders.  Am I missing something in this script?  Shouldn't the name of the default Public Folders in Exchange 2003 be Public Folders? Can I set the PublicFolder for Exchange 2003 for the Exchange 2007 Management Shell?

Set-PublicFolder -Identity "\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY\EX:/o=COG Mail/ou=First Administrative Group" -Replicas "<server>\Public Folders"  

(Of course I am adding our server name in place of <server>)

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ExpertAssistAuthor Commented:
I just noticed that I can see the Free/Busy information when go to OWA 2007 to schedule an appointment.
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kblumenCommented:
This is probably an issue with the Outlook Autodiscovery
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kblumenCommented:
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kblumenCommented:
Are these Outlook users connecting via RPC over HTTPS?
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kblumenCommented:
Sorry just noticed you said all clients are on 2003.
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kblumenCommented:
I presume this will be rectified by the original link. I will need to address your question once I get back to my computer.  What is your progress thus far?  
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kblumenCommented:
I believe that the commands are specifically for exchange 2007. I will look closer at the article once I am off the road.
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kblumenCommented:
Check this article - might be easier to follow:
http://support.microsoft.com/kb/945602
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ExpertAssistAuthor Commented:
It seems to work to move the mailbox back to the Exchange 2003 and then move to the Exchange 2007 server again.  In one case, a user rebooted his computer, then his Free/Busy information was available.  I'm going moving a couple more accounts to see if I get consistent results.
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ExpertAssistAuthor Commented:
Thank you so much for your help.  Just an FYI for those that aren't into using commandline. It appears that you can also get the same results by using the GUI.  In the Tools folder in the Exchange 2007 Management tool, there is a Public folder Manager.  Thanks again.  You were a great help.
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