Apple has made available its latest version of OS X Server. Version 10.1.2 makes some needed improvements. This from Apple:
The Mac OS X Server 10.1.2 Update delivers improved reliability and performance of Apple file services, Apache web and Mail services under heavy load.
It includes security fixes for FTP and the BSD Line Printer Daemon. Enhancements have also been made to improve server administration, SMB printer sharing, WINS registration and system clock accuracy.
Visit Appleis website for more information.