Walls sound useful to an operating system as insecure as Wind0ws:
used for shelter, protection, or privacy, or to subdivide interior space, to support floors, roofs, or the like, to retain earth, to fence in an area, etc.
So does life without walls seem like a good idea to you? and further more how did the marketing dept not manage to spot this?
Initial reports about windows 7 have been very positive but we will see.