how both linux&window clients can MS 2003 server access active directory users profiles

We have on client side 200+ PCs and 600 + users all of them are windows based and on server side 2003 server in domain (active directory) environment with 100 MB of disk quota is assigned to each user. Now i want to replace windows client OS with linux but nothing want to change on server side. How can I achieve this where my windows and linux clients both can login through active directory and at the same time they can access disk space which were assigned to each use.
Please guide me with the right direction and if any tutorial or material that you wanted to suggest in this regard.