It looks like Microsoft bought out Caligari inorder to build some kind of 3D world meeting place that ties in the MS Virtual Earth. Could this be the beginnings of Microsoft's Second Life type application?
I checked out Caligari's website, and they announced both that MS and Caligari are teaming up, and also Caligari released a new product called truePlace.
Read more about truePlace -
I first learned about this from-