Hi, This seems to be an interesting scenario. It has been reported to me by a friend of mine. Exchange was installed at the BDC. The PDC for this domain crashed. The persons at that moment, did not promote BDC to PDC. They restarted the BDC and now at this reboot, it can't find PDC. Now it can not be promoted to PDC. As the users cannot be authenticated, the Exchange box does not work. Is there a way? <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Regards, Chand Deshwal (M.Tech CS&E, MCSE, CCNA) Network Administrator Kampsax India Ltd., Gurgaon ph: +91 124 6348259-62, Extn. 712 chand@xxxxxxxxxxxxxxxxx <mailto:chand@xxxxxxxxxxxxxxxxx> http://www.kampsaxindia.com <http://www.kampsaxindia.com/>