Throughout the book there are statements in how something is not in a previous version and what is new in Tomcat 6. For the most part migration should be relatively easy as many configurations are nearly identical. However, there are a few changes to the configuration and the book does make clear note of that.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com
subject: Professional Apache Tocat 6: migration from former versions