Trust between 2003 domain and 2008R2 domain with old Windows NT4 client

Hi all,

I've a Windows Domain "OLD" (Windows 2003 forest & domain functional level), I've some old Windows NT4 machines that are client of this domain. I've a new domain "NEW" (Windows 2008R2 forest & domain functional level), I plan to create an external trust between theese two domains, my doubt is:

"Do the old Windows NT client have access to the resource of the "NEW" domain? For example can they access a file share on the "NEW" domain?"