Encountered first bug after installing the Mac OS X 10.5.7 combo updater on my Leopard Server: The update corrupted my iCal shared calendaring service to where I can no longer authenticate using my admin username and password.
iCal service was working fine under OS X 10.5.6. To fix the problem, I’ll restore my server to its 10.5.6 configuration using a recent backup.

See my reply to your post on Apple’s Mac-OS-X-Server mailing list:
http://lists.apple.com/archives/macos-x-server/2009/May//msg00348.html
By: David on May 18, 2009
at 5:32 pm
I was referring to running iCal service under OS X (10.5.7) Server that’s got a Standard configuration. I’ll take a look at some of the Discussion board threads later this evening.
By: Dale Komai on May 18, 2009
at 5:37 pm
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at 8:32 pm
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at 5:11 pm