What about Lotus Notes?
Disappointed that IBM Lotus Notes/Domino was not featured. It is 2nd in market share to MS in business email/messaging and not as far behind as one might think. If IBM knew how to market it better, Notes would be neck and neck with MS like they used to be. Notes/Domino is more stable and secure than MS, and with IBM Connections and the social business integration, it's all very impressive. Corporate clients should consider it.
Keep Up with TechRepublic