alt Hacker NewsI was a student part-time administrator/systems programmer at the Purdue Engineering Computer Network at the time. Our OS installs had enough local mods (and we had enough non-VAX, non-Sun architectures) that we were immune to some of the worm's modalities, but the sendmail debug mode exploit at least still caused a lot of consternation.
Diversity is security! I wish more people understood that. It may be more difficult to manage a bunch of diverse systems, but they are much more resilient to attacks.