Calendar is pretty simplistic. You can tie it in with Google and Yahoo calendars, and make edits, but navigation is pretty basic, as are the various views.

The Messaging app as it stands is extremely limited--you might even say it's broken. You can update your Facebook feed and interact with the three people you know who use Microsoft Messenger. It's a far cry from a universal messaging application, so until Microsoft improves it substantially, it's more a toy than a useful tool.

The Photos app is slick, albeit a little shallow. You can access your Facebook, Flickr, and SkyDrive photos, and you can create slideshows. You can't, however, edit photos or even launch a photo-editing application.