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Public Folder suddenly not working for Outlook 2010 with Exchange 2010

Out of the blue, my Outlook clients no longer can access their Public Folder.
The error is
"The set of folders cannot be opened. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance"

Mailbox is working fine only Public Folder cannot be accessed. However, using OWA to access Public Folder is okay. I've rebooted the CAS server but to no avail.
Any ideas?
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frukeus
Asked:
frukeus
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1 Solution
 
Glen KnightCommented:
Your not in a mixed environment? Is it pure Exchange 2010?

Do all users receive this error or only a few?
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frukeusAuthor Commented:
Is a mixed environment, upgraded from Exchange 2003 but all mailboxes and public folders currently running on Exchange 2010.

All users received the same error.

Eventually, managed to resolve the problem by rebooting the mailbox server on which the Public Folder database resides. The mailbox DAG database was working perfectly okay on this mailbox server though. I had to move the active copy of the mailbox database to the other DAG node, reboot and move it back.

Still no idea why Public Folder encountered the error.
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Glen KnightCommented:
Public Folders cannot be part of a DAG so it would need to be replicated to both servers if you wanted to make it available.
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frukeusAuthor Commented:
Yes, the Public Folder resides on one of the DAG node is replicated to all my other DAG nodes and previous Exchange 2003 servers, but is not part of the DAG.
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Glen KnightCommented:
But it's working now?

I can only suggest that there is something wrong with your replication, you may want to have a look at: http://technet.microsoft.com/en-us/library/bb629523.aspx
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frukeusAuthor Commented:
I wasn't getting any errors on the replication. It was working fine before the error and after the reboot. Found a similar post that required reboot for Public Folder mailbox server to work.

http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/e7f4403a-e5e2-4e8a-894b-2d7027281407/
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frukeusAuthor Commented:
I've recently encounter the same problem on another Public Folder that resides on a seperate mailbox.
The mailbox server has to be rebooted for the Public Folder to work on Outlook 2010.
Strange thing is when the PF cannot be accessed by Outlook, OWA can open the PF without any issues.

A reboot sorted out the Outlook issue.
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frukeusAuthor Commented:
Reboot of the mailbox server hosting the PF
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