Try out Lotus Foundations for Free!

Download a free 30-day trial of IBM® Lotus® Foundations Start, an on-premise software appliance and a complete solution for businesses with 5-500 employees who have limited or no in-house technical resources. Lotus Foundations can be launched within 30 minutes and leverages self-managing and self-healing capabilities that minimize the need for human intervention. It enables customers to establish a company network, do e-mail, create and share documents, centrally manage files, backup data, and protect business network from unwanted disruptions. Also included in Lotus Foundations Start are the IBM Lotus Symphony tools allowing you to work with spreadsheets, documents, and presentations.

http://www.ibm.com/developerworks/downloads/ls/lfoundation/learn.html