There are three flavors of the Full Version:
- The Pro version is the real deal! All the features you need, unlimited use for one single user. If you want multiple (unlimited) users in you company to use the software, please buy the Enterprise version.
- The Business version has the same features as the Pro version, but can be used by up to three users.
- The Enterprise version has the same features as the Business version, to be used by an unlimited number of users at your company. If just one person is going to use the software, buying the Pro version will be cheaper.
Other than the number of users, all versions have the same features (multiple recipients in To, CC and BCC, adding attachments, High/Low priority, etc.)