First, off, thanks to the talented moderator Andrea_r for the wonderful held she gave me in getting by Multisite installation up and running. Kudos. Visit her site and buy her books: http://wpebooks.com/
Second, in the course of following her advice, I am cleaning out spam and removing old, old inactive blogs.
But I have encountered a few who I think need to remain available, should the users decide to start up again.
It's fairly obvious what it means to delete a blog. Done that for a lot of them. But what is the difference between "archive" and "Deactivate." And which should I use if I do not want to necessarily break any incoming links to their posts, but want to cut off the possibility of spam comments and spam registrations.
Oh, and is there any sort of plugin that would let me see which themes and which plugins are being used across an entire Multisite installation?