Hi guys! Here is the situation that I have, I have a Exchange 5.5 server that is running on Win NT 4.0 PDC. Our client has just purchased a new server in which he wants to run windows 2000 and exchange 2000. My beggining thoughts for migrating this project was to migrate the existing Win NT 4.0 PDC to windows 2000 then joint the new windows 2000 server to the same domain and run DCPROMO to make it a domain controller of the existing domain and once that was completed install ADC in the new server and synchronize exchange 5.5 with AD. Then install exchange 2000 in the new server and migrate the mailboxes from the old server to the new server. The problem now is that the old server that is running exchange on the Win NT 4.0 domain is running out space and I don't have enough space to upgrade to Windows 2000. Do you know any method that I can use to migrate from exchange 5.5 to Exchange 2000 taking in consideration that I will be migrating into a new server running windows 2000? P.S.: Thank you in advance!