NDS 6.21 can be downloaded from the Novell Support Web site. The filename is ds621.exe.
Each Windows server must be running NDS eDirectory 8.0 or later.
IMPORTANT: There is an issue when installing NetWare 6.5 into a replica ring that contains NDS 7.x which results in a failed install with the error "-609 Missing Mandatory." This issue is resolved with NDS 7.62b. NDS 7.62b has only been tested on NetWare 5.1. Because NetWare 5.0 is a discontinued product (see Novell Products - Support Life Cycle), NDS 7.62b has not been thoroughly tested on NetWare 5.0. Novell has performed very limited testing on NDS 7.62b running NetWare 5.0 for upgrade purposes only. Novell will support, on a limited basis, NDS 7.62b running on NetWare 5.0 when upgrading to NetWare 6.5. If issue outside of the upgrade arise that are specific to the NetWare 5.0 operating system, upgrading from NetWare 5.0 to NetWare 5.1 will be required in order to resolve the issue.