From the developer: Smartworks-PE (Personal Edition) is a cost effective business productivity tool which helps you to manage projects, track issues and measure the progress in each of your business activity. Smartworks-PE includes award winning project planner and Smart tracker plugins to help you manage your business. Smartworks-HO (Home Office): If you are running a Home office which has less than 5 people working then we would recommend this edition for you to buy. It could be also applicable if you want to try out Smartworks in a small way in your department to go for this. Smartworks-SO (Small Office): If your office is small and employs less than 10 people then we would recommend you to buy this edition of Smartworks. Smartworks-Pro (Professional): If your organization has more than 10 people (but less than 50 people) who would be collaborating on various issues then we would like to recommend you this edition. Smartworks-Enterprise: If your organization has many more people than 50 we would recommend you to go for this edition. This has a server which has unlimited user license (site license).