The WebObjects Developer CD included in the Mac OS X Server bundle is incorrectly labeled. The disc reads "For Windows NT," but the software on the disc is actually for the Mac OS X Server platform. There is a label on the disc's sleeve that points out this inaccuracy, but if the disc becomes separated from the sleeve there are two other ways to distinguish the Mac OS X Server CD from the Windows NT CD. Both discs include a version number and part number just below the words "For Windows NT" but the version and part numbers differ:
| Version | Part Number |
| Mac OS X Server 4.0.1 | Z691-2252-A |
| Windows NT 4.0 | 691-2093-A |
Although the Mac OS X Server version of the software will install on Windows NT, entering the Mac OS X Server key results in a error message: "Invalid serial number for this platform."