Hi,I use to migrate accounts from exch5.5 to 2003. The 2 servers beeing in the same organision I don't have to re-setup the hundreds of Outlook.Today again, I must destroy an Active Directory which had been created only for Exchange (AD MAIL), and install a new Exchange server on the usual Active Directory (AD COMPANY).My problem is that both Exchange server are 2003. And then both AD are 2003 too...But both AD are linked by bi-approbation, then each exchange account use the AD account of COMPANY for authentificatingI really want to migrate without disturbing users (120 users). If both server are in the same exchange organisation it become very easy, but is it possible with 2 exchange server in 2 different Active Directory ???thanks if you can find a way

Hi, You can use the migration wizard: http://support.microsoft.com/kb/328871/en-us Leif