The browsing service depends on having all systems on the network to share a common netbios name. The Workgroup or Domain name must be the same on all systems in order browse properly. Second the binding orders are very important as well. If you arerunning a pure TCP/IP implementation this shouldnt be a problem. I have seen many installs though where NETBEUI AND/OR IPX/SPX is running as well. In many cases its also a mixed bag, some systems running IP and Netbeui some running TCP/IP and IPX/SPX. If you do have a need to have multi protocols running, you should make sure that a single protocol you wish to use for most communications, is in the top of the binding order on the systems in quesion. I would assume that TCP/IP is the protocol you wish to use because of the Unix server. Your NT Mail server Im assuming is your domain controler, the workgroup name in the 95/98 systems must use the same name the NT Domain is set to. The NT server is your "Domain Master". Finaly in cases where your workstations are utilizing intellegent type switching, broadcasts are sometimes turned off, if this is the case you either have to enable the broadcasts or utilize a WINS service on your NT server or another NT server system so that the workstations register with it and thus can find each other and fill the browse list. In reality what your facing is browsing 95/98/NT = Bad the service is a hold over from the Microsoft LAN manager days and you would be best served moving to Windows 2000 in the future. Hope this helped, let me know if you have more questions.
Pete
