I have a Win2K Compaq Proliant 400MHz 4way server with 1meg of ram and Exchange 5.5 SP4 loaded on it. The problem is that after I loaded about 200 mailboxes to the server, moved from another server in the same site, approx. 20% of the users that were working just fine can’t contact (ping) the server. Also the server can’t ping the client. I took a laptop and used the exact wires at one of the clients that can’t ping and it worked fine. The 20% worked fine Friday in the evening and not on the following Monday morning. The only change made over the weekend is that approx. 100 mailboxes were moved to the server.