There are three versions. Version Small Business has one more restriction - maximum 25 users and no possibility to do fax routing. Let's see it from the side of the user or company. They do not have to print the document, spent time by searching for addresses number, queuing in front of manual fax machine, or worrying about right set up of fax modems connected to their computer. Opposite, more curious and experienced users are able to change requirements for sending and monitor in details processing and status of the documents.
Company is probably mostly interested in economical side.
There are no requirements for manual faxes and special fax paper and also no requirement for nay training. It is possible to delay faxing using special features until telecommunication charges are low, and to find exact costs for faxing as well. In case that company has many branches, it is possible to use fax routing feature, transparent to users, what means transferring the fax by electronic mail to the branch, which is closest to destination place of the fax and then sending the fax to addressee with lower local telecommunication costs. Not neglectable are also aspects of security and law. Fax can come directly to the mailbox of user, without being seen by anybody else.