I'm a business guy that has a lot of meetings. Why would I use this and not Outlook?
I'm surprised I haven't had an answer to this. I thought I was the target market. This looks like an inferior web based edition of Exchange/Outlook functionality. It was a serious question - is there an advantage to using this? If not, you might need to do some market research to better target the problem you are trying to solve.
I think the examples are pointing in a different direction, i.e. a simple and straightforward tool to help you juggle daily life with a focus on spontaneously rearranging tasks, rather than fixed business meetings and scheduling events for teams even.