I have an SBS2000 server which I am trying to replace with a new SBS2003 Server. Due to certain issues I tried to upgrade the 2000 box to SBS2003 but this would not complete due to not being able to locate all Domain Controllers. Whilst I believe this to be an error, it has resulted in a problem with email transport. Basically, whilst mail is moving in and out of the network to external addresses, nothing gets delivered internally. In fact all internal mail is currently going to a bad mail folder on the server, any ideas where to look? Thanks