I have a DFS that I inherited and which was not properly set up. I have been cleaning it up and fixing it with time. I just discovered that there are 6 "dead" namespaces besides the one we use in production. I would like to remove them but can't do so from the MMC, need to use DFSutil. Read the documentation and googled, but I am totally unsure of the command!
NOTE: there were also some dead DCs that were forcibly removed and left several traces. These namespaces are not on any current server.