Client has SBS 2003 sp2 box with Exchange 2003 SP2 - one box, one domain, its DC, internal DNS, DHCP, FileServer, etc. for about 12 active users. Month ago clients noticed not receiving all emails though senders receive no undeliverables. Was happening once a week, now happens all the time. Event viewer really doesn't show anything related to Exchange, I think. Opened ticket with Microsoft and Dell - MS ran troubleshooting tool and won't go further until couple of hardware performance issues taken care of. Dell ran basic diagnostics, all look OK, so dont think its hardware. I am stuck and could use some serious help. Thx.