Hi,This is venkat i had one query with you which is why should Raise the Domain founction level while instaling Exchange2007 on windows server 2003 (from winodws 2000 to 2003 ) without these task we could not install Exchange 2007 on windows server 2003 and can you go though this query to understanding this scenario.please help me . thanks venkat

Are you in 2000 mixed or native? If you are in mixed mode you need to go to Native mode. http://technet.microsoft.com/en-us/library/ee338574%28EXCHG.80%29.aspxMark Morowczynski|MCT| MCSE 2003:Messaging, Security|MCITP:ES, SA,EA|MCTS:Windows Mobile Admin|Security+|http://almostdailytech.com