Mac OS X Server 10.1.2 Update

is available from the Software Update preference panel. From the ReadMe:

"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."

We had a little difficulty with this update on our G4 Cube server. First it hung at the start of optimization. We force quit the Software Update preference panel and rebooted. Then it hung half way through the download and we were able to quit the panel. It downloaded, installed and optimized fine on the third try.