It is vital to know how many people can actually use the crystal report viewer that you install on your system. Beginning from just three users, you can go up to fifty users or more, making viewing and editing of a report, fairly easy. If yours is a big organization, it would be better to go in for crystal report viewer that allows at least fifty viewers. This will help you save on the cost of the software and make it more economically viable to use in your organization at any given time.