What third party solution is recommended? Is there a reason AFP support
wasn't added with Service Pack 1 for OES? Should I not be using it for any
particular reason?

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Linux-Enabled eDirectory Users
Users who are defined in eDirectory, granted file system trustee rights to
the NSS volume, and Linux-enabled with Linux User Management. These users
can access an NSS volume with NCP, CIFS/Samba, NFS, AFP (requires a
third-party solution), or Linux utilities, commands, or services.

For more information, see "Access Control for NSS on Linux" in the File
Systems Management Guide for OES.