Hi , We have 2 sites and both the sites are connected with Fibre and have Windows 2000 Server and Exchange 2000 as Mail Server. The Parent Domain Controller is on Site 1. and we have the ADC at Site 2. The problem have are facing is that the moment Site 1 is down or we loose connectivity by fibre cut the authentication of users in Site 2 stops giving an Error of GC not Available. One of my manager has suggested that if we create a Child Domain, then there won't be any Logon Problems. The main problem what I am facing is that how can we move users from Parent Domain to Child Domain. What steps should one follow and how to migrate users from Exchange Server to another Exchange server(Child Domain) Eagerly waiting for ur response as my hob is at atake. Regardsm Gautam