Windows 2003 active directory

Hi all,

I want to change my old server HP-ML150 G3 Server to New one ML-350G.

Presently it running with windows2003 server with 100 users of active directory.

I want to migrate that old server to new server as it is as runnig currently .

please help in this regard as my all old settings like AD \Group policy etc …
migrate properly on new server