Exchange 2007 Out of Office failure

I have a Virutal  Exchange 2007 server (windows server2003) on which the out of office feature works fine.
I recenlty created a new virtual Exchange 2007 server on a windows server 2008 os. I've transfered all the mailboxes, the original exchange server has been shutdown and everything is working fine except for the out of office feature. It takes a very long time to access the out of office feature and sometimes it will not load and give a message that the server is busy. When I reactivate the old Exchange server, the access to Out of office is always immediate. The client computers are using Outlook 2007 to access the Exchange server.
FraserreidAsked:
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Jian An LimSolutions ArchitectCommented:
make sure your EWS server is accessible

also access https://webmail/ews/exchange.asmx to make sure it did not prompt and access.
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FraserreidAuthor Commented:
Resolved on my own:
Problem was that select users had limited access to the internet. Their access need to be expanded to include web access to the new exchange server.
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FraserreidAuthor Commented:
resolved on my won
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