Can I create a share on a Windows Server Domain Controller for anonymous Mac OS access?
Folks, be CAREFUL with domain level guest access. It opens your entire Windows network up to anyone who can access the network (Microsoft leaves this off for a reason).

If you have to share the folder on your DC then your best bet is to make an account, (call it MacGuest or whatever you want). Assign it a password that doesn't expire and can't  be changed and give it to anyone who needs access to that share.

They can click on the "remember this password in my keychain" option and never have to enter it again.

Just my 2-cents...