How much control of your business software and data do you want? How and where do you want to access your data? How do you want to pay for it?
Act! software offers you the choice to own your software with a perpetual licence or “rent” it by choosing hosting. Owning and buying a perpetual software licence makes sense if you want total ownership and control of your data and the system running it.
Act! software out of the box is on-premises however there are five ways to own and view Act! Premium remotely:

Web, mobile and synchronised access deployment is included as part of the perpetual Act Premium licence at no extra cost. You can run the applications from your own server with no monthly “hosting” costs.
Bear in mind you will need to keep your current version of Windows intact and your current version of MS Office.