Why Netware is still used...
because it's freaking stable as bedrock. Still have 3 or 4 old Netware 6.5 boxes around here doing various little things, and they just don't crash.
Sorry, but OES2 has proven to be a pitiful replacement for real Netware. I migrated our 5 primary NW and Groupwise servers to OES2 this past summer and have regretted it every since. But the truth is, Netware is dead and has no future, and as an Admin, I have to at least attempt to keep our systems relevant in the modern day, hence the migration to OES2. But as that sucks balls, and with no good alternative, we're heading off into the wonderful world of Windows/Exchange next year. {Deity} help us...
If the alleged in-place upgrade from NW to OES11 is for real, that's really cool. Must be some high-end wizardry to convert NSS volumes in-place. Or maybe OES11 can just mount them as-is.