About Mac OS X Server 10.5.7 Update
The latest release of Apple”s UNIX server operating system makes it easy for small businesses, workgroups, and enterprises to take full advantage of the benefits of a server. With Mac OS X Server, users can effortlessly share files, schedule meetings and events, exchange instant messages, send and receive mail on the Internet, access the organization”s network remotely, publish podcasts, and host websites, wikis, and blogs.

Learn more about Mac OS X Server.

What’s New in this Version
The 10.5.7 update is recommended for all servers currently running Leopard Server. This update includes general operating system fixes, as well as specific fixes for:

- promoting Open Directory replica to master
- offline login for Portable Home Directories with FileVault
- client management using a hardware UUID
- group access lists for managed clients - adding metapackages (.mpkg) to System Image Utility workflows

For detailed information about this update, please visit this website

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For explanation of what a SHA1 digest is, please visit this website: About SHA1 digest

For detailed information on Security Updates, please visit this website: Apple Security Updates