Move Server to new Domain

We have to move about 300 User to a different domain. The Users are working in the Domain RL(ex. max bauer/RL/at) and after moving they shall be in another domain

(ex. max bauer/rl/RAL/at). So RAL is a domain, which already exists and the RL was created as an OU in this domain.

We figured out, that it is easy to move Users between OU’s in one domain, but not so easy to move them between two domains.

Somebody told me to copy the server-certifier and all user per copy and paste in the adressbook to the new server and then just “move the user to a different certifier” using the admin-process.

So does anyone know a more “clean” process?

thanks in advance

f.