This looks a dump of some internal mailing lists. I didn't see any "private" email. You'll see that a bunch of phone numbers and addresses had been scrubbed, too.
I'd agree that it's probably more creepy if you never worked there.
I would feel a bit misled if most of the internal mailing lists I've been on were ever made public. I suppose it depends on the size, though. I've been on research-group mailing lists of ~10 people, and that would really feel like a breach of confidence, to release to the world at large emails that were intended for a relatively small circle of colleagues. On the other hand, if someone made a 200-person mailing list's archives public, then I would probably not be as annoyed.
I'd agree that it's probably more creepy if you never worked there.