Active directory & Users Backup

Hi 

I have Active directory on my server ( Windows server 2008 R2) And  Many users on it so.. Now  I want move allusers to the new server installed on Windows server 2008 R2 And format old one .The question ishowcanImove usersto.

The question ishowcanImove usersto the other active directory.

I hopetohelp

Thank you very much