Atlassian has a hosted version of their product, so that takes all the pain of admin away. When I used it a few years ago with a few hundred users with a ton o

Atlassian has a hosted version of their product, so that takes all the pain of admin away. When I used it a few years ago with a few hundred users with a ton of content, we had some performance issues with the search feature. I've heard that was resolved, and have used it since with a smaller team and had no issues. It's really nice to use. There are thousands of wiki's, some with pages and pages of features, but they are so nasty nobody ever uses them. If you want something everyone will use (yes, devs and suits alike), Confluence is pretty nice.