After much deciding i have bitten the bullet and decided to do the migration. I have a question thoe i set up a test bed. I built a fresh nt4 bdc on a box replicated with the domain took it onto my test network, prometed to pdc then just put the win2003 cd in and followed the wizzards, I now have an migrated 2003 ad network(all be it small) with everything appears to have migrated across with no problems. I have taken a couple of workstations off the normal domain plugged them into the test bed and log in. the first time they log in it takes about 5 minsas they update there info and move across to the new domain, dynmic dns works fine. Now to me that seemed to easy and once a box has logged onto the ad its no way back. I dont want to just put it live and have 200 pcs connect to ad reconfig themselevs only to find a problem and then its to late. Also is there any problems with have 2k member servers? I have done 2k ad migrations a long time ago and they were no where near as easy as this.