Apple has released the 10.0.4 update for Mac OS X Server. The release includes enhanced networking support, a security update for MySQL and Samba (which provides Windows networking services), and more. According to Appleis Mac OS X Server 10.0.4 Update page:
The 10.0.4 Server Update delivers reliability improvements for Apple File Protocol connections, printer sharing, FTP, mail and directory services. It includes MySQL and security updates to Samba. This update also improves migration and administration of users and groups, home directory settings and Macintosh Manager accounts.
You can get more information and download links for the update at the link below.