We have a mixture of Win2K Pro and NT4 clients. From a W2K Pro workstation, if you browse mapped network drives (on NT4 servers) from NT Explorer, Explorer will intermitently and for varying lengths of time enter a Not Responding state. This does not happen to our NT4 clients. We have a normal 100MB Switched Ethernet network with loads of spare capacity. I’ve racked my brains and can’t figure out why W2K should be doing this.