From what I can tell it's very common for old houses in Ottawa to have asbestos in the walls. As long as you don't ever touch it or drill random holes in walls, it's not dangerous. But if you need to do any major work on your house you need to move out for like a long time until it's done and have an expensive team of people to safely remove any asbestos in the area.
It's extremely common for any building that's more than about 35 years old to have asbestos in it. The biggest problem with having it is that you can't safely do renovations without it becoming a much bigger project (because of remediation). It just being there isn't really a problem in and of itself.
(yeah, I know I'm basically saying exactly what you said, but I think it needs to be reinforced because there's a lot of weird ... "ZOMG ASBESTOS PANIC" posts going around...)
Everyone posting in this thread has probably lived or worked in a building that had asbestos in it somewhere without knowing it and is not dead yet.