If someone asks me this, then I'll find out the background experience that person has. A mainframe expert like you would be proficient in dealing with batch centric jobs. As Ranganathan put it, SAAS has a broad meaning.
In my opinion, mapreduce and big data management has got more in common with mainframe people than cloud centric environment.
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