Windows Phone 7 has taken the approach on making everything simple and functional at the same time, and this has gone to the Calendar application.
…you canâ€™t be both simple and full-featured. Microsoft has opted with Windows Phone, in v1 form anyway, for simple. This is arguably the right choice, but the limitations of this choice will appear in multiple places all over this system. And this is just one basic example.
You can still sync the usual Windows Live, Outlook, and Google calendar but now they will have an assigned color to their content.
This is still just V1 of the software, and so I am sure they can put a little more features on to this software by next summer.