Like and Use are two different things. It's a matter of giving in to the machine. Everybody has adobe reader. Everyone wants it in PDF format. That's why I use it. There are some reasons to like it. Sending a document from windows to unix and back helps to keep the format better than OO does for one. I'm sure there are more, I just don't have them. Really though, it's like asking why we use Autocad? Well, it's the standard. Everyone knows about it. You can't get away from it.