Our biggest installation:
http://www.aiesec.net
OACS 4.6, .LRN 1.0
Oracle 10g
Debian (Suse for Oracle)
230,000 users
We will upgrade to OACS 5.1.5/.LRN 2.1.3 within the next two months.
We also have a few other production sites, including our own, all:
OACS 5.x, .LRN 2.x
PG 7.x, 8.x
Debian
up to 1000 users
