Cloud Software as a Solution (SaaS)
including email & calendar
Software as a Service (Saas) is a great way for you to have the latest versions of software without having to spend vast amounts of money or have to worry about conducting updates and upgrades yourself, it's all included.
With SaaS, you have access to your application on any device, from any location. Try finding an on-premise software package that would allow this kind flexibility. Combine that flexibility with superior sharing capabilities, world-class security for your file storage and low initial cost and the choice is clear- SaaS is the way to go.