Outlook 2003: Contents of Additional Mailbox do not refresh

We are using Exchange 2000 with Outlook 2002 sp1, sP3 and Outlook 2003 SP2 clients.  We have a mailbox on the server which represents our helpdesk and all staff members have access to it.  This has been set up as follows:
Exchange Advanced > Mailbox Rights: Everybody has full mailbox access
Mailbox > Delegates > a distribution group have send on behalf of permissions and no access to the inbox.

Users then add the mailbox to their Outlook via the Advanced - Additional mailboxes option in Outlook.

The problem we are having is that if somebody reads or moves a message from the Inbox the results are rather unpredictable for the other users.  
The Outlook 2002 sp3 person sees the change immediately.
The Outlook 2002 sp1 person has to click onto another folder and then back before the change is visible (we are going to do an ugrade to sp3)
The Outlook 2003 users have to press F5 to refresh in order to see the update

Can anybody shed any light on this?

Thanks

A
SokellaAsked:
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SembeeCommented:
That usually means something is blocking the traffic from the Exchange server to Outlook to tell Outlook something has changed. A firewall is the most common cause.

Simon.
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