Zoho is a web collaboration suite designed for the web user in mind. It contains software for word processing, spreadsheet, presentation, dataabse, calendar, note-taking, project management, email, customer relationship management and so on, but you don't have to download or install any software. It is all available on your browser. It has evolved from a single app to a powerful complete online business application. The all-in-one suite without the bulk. And yes, they do emphasis on security. Their servers use cloud computing, which makes it more reliable. With over 3 million users, they must be doing something right!