Hi, friends. In my exchange server I have 2 partitions. my exchange MDBDATA folder was there in 1st partition, the partition is getting full. I moved the exchange database to the second partitin as suggested in documents. after two days when i tried to create a user its giving the Error. "Message box title : Active Directory Message : Windows cannot validate teh uniqueness of this proposed user name with a global catalog server because the server is not opeational" Is this because of moving database from one partiton to another partition. How to deal with this problem. please help me........... Thanks and Regards imtiyaz.