Scenario I have following network infrastructure installed at my office primary domain controller (windows 2003 server 32-bit) DNS is also configured on DC HP DL 380 machine where I have installed windows 2003 R2 edition which is 64-bit I have Microsoft exchange enterprise edition 2007 64-bit. I want to install ms exchange on above said machine and got following errors Readiness Checks The system and server will be checked to see whether exchange is ready To be installed Organization prerequisites Error: Setup encountered a problem while validating the state of active Directory. Setup could not retrieve the schema master domain controller information from active directory Hub Transport role Prerequisites Error: Setup encountered a problem while validating the state of active Directory. Setup could not retrieve the schema master domain controller information from active directory Client Access role Prerequisites Error: Setup encountered a problem while validating the state of active Directory. Setup could not retrieve the schema master domain controller information from active directory Mail Box role Prerequisites Error: Setup encountered a problem while validating the state of active Directory. Setup could not retrieve the schema master domain controller information from active directory Please tell me that what will be the solution. The problem which i guess is the integration of AD with Exchange because AD is 32-bit and Operating system and exchange is 64-bit as I mentioned above Regards, Muhammad Imran System Administrator Pakistan Institute of Medical Sciences Islamabad, Pakistan

This is a delayed post but the info should still be relivent.I recived this error and found that the FSMO role for Schema Master had been lost, this can be tested with DSQUERYSuccesfully repaired with NTDSUTIL and Seized the Role, Install completed fine.