Dell talked about compatibility issues in previous posts. You should do a search for what she said. Re the upgrade, there are lots of changes from 9 to XI. You should check to version comparison chart on the Business Objects website. Personally, dynamic cascading prompts is pretty significant and you can also display images in a report using the filename. They also rewrote a lot of the database drivers so that data processing is faster and more complex table linking is supported (i.e. not buggy).