Reading up on this from the Microsoft Team RSS blog and must say that the one feature they are proposing that could be enabled by SSE (Simple Sharing Extensions) is enough to sell it to me, I've extracted it below but the full thread is here .
For example, why do your work and family calendars have to be separate? With SSE you could share your work calendar with your spouse. If your calendar were published as an SSE feed, changes to your work calendar could be replicated to your spouse’s calendar, and vice versa. As a result, your spouse could see your work calendar and add new appointments, such as a parent-teacher meeting, or a doctor’s appointment. Moreover, SSE could be used to replicate a set of calendar entries among a group of people, each working in a different company and using different infrastructure.
