Mail retrieval doesn't work most of the time

Hi there,
I am network administrator for a Windows 2003 network with an Exchange 2003 server. In this network I have 3 apple's with os/x 10.5.4. These 3 mac's use the default Mail facility and use POP to get the mail from the Exchange server. Since some weeks 2 of these mac's suddenly won't retrieve mail anymore and give no message whatsoever. Only 1 Mac keeps working fine regarding mail. On an external site I also have an Mac with an older OS and I have enabled POP en IMAP on the firewall. From this Mac I also do not have a problem getting mail. Since they used to use POP I gave up searching and tried starting to use IMAP. Again this fails on 1 'problem' Mac. The external Mac goed fine with IMAP.
I can ping to the exchange server, i can perform a portscan to 110 and 143 to the exchange server. I can't tracert the exchange server via it's hostname. I thought of network settings and switched it from DHCP to static, checked DNS, but non of them pointed me to a solution. I don't know how to get this working.
Hopefully somebody can point me into the right direction. I'm a Windows administrators so my knowledge of mac's is minor.
Marcel
Message was edited by: support_pl: I forget to mention that with Outlook Express I do not have problems opening the mailboxes.

Nobody?

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