It turned out I just needed to install the most recent version of the MS drivers. Everything now works like it did.

The latest MS Drivers can be found at: http://www.microsoft.com/hardware/en-us/downloads (the versions in the MS Downloads Center, and in Google results are older which don't work with Lion)

lion: assign buttons on a Microsoft mouse
I'm not native in the English language and I'd like to know if when I say "Viewpoints made easy" your perception leads you to something like:


  Viewpoints made easy. An easy form to
  connect and represent points of view
  and understandings about the world
  knowledge.

