Wow. i dont know. Ive never used calc nor excel for things that big. For that Ive used python or php/mysql. I use spreadsheets a lot, even complex ones, and calc always work for me. Anyways, you are right in regarda to the lack of support/books. Of course. Same happens with a lot of things. They are not mainstream (yet) because they are projects that havent had the money or power corporations like microsoft has had for lobbies and marketing. So we can struggle a little on the transition (some very brave pioneers have already paved the way for us, so its not that hard anymore) and hope we are contributing to a libre/free future in which digital technology helps build a better and fairer society for all. And then, they'll become mainstream and we'll have more books, support and communities than we ever dreamed of before.