Authenticate win users with AD accounts to shares on Xserve

We have a Xserve, bounded to AD, with some shares on. The mac users, can authenticate to the shares using AD accounts, but the windows users cannot (privileges on the shares are set with ACL´s). The only way to let the windows users connect to the shares on the Xserve, is to create local users on the Xserve, and giving them rights to the shares. Is there any solutions to let the win users connect with their AD accounts?