Outlook 2007 can't connect to pop3 server ......

we have hundreds workstations which all setup pop mail server and couple of 2007 outlook got error says that can't connect to mail server (pop), most of 2003 outlook are fine. I fixed one of outlook 2007 by flushing it's dns and edit host file by adding pop mail info, but there is still one  can't be fixed by doing same way. Is anyone has better idea?

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dd2makerAuthor Commented:
no specific error, just shows that can't connect to mail server .........
was there an error message?
dd2makerAuthor Commented:
no comment
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