I navigated to the Logitech home page and I looked into your recommendations. The Unifying receiver is a brilliant idea and I do not know if Microsoft has an answer to that technology yet. Based upon what I see for their wireless keyboard and mice products, I think the answer is no. The Logitech website has an automated guide that points me to products sold in Australian dollars.
I checked on Amazon and NewEgg for a wider selection of mice, but I did not see anything that I wanted that would be as cool as the Microsoft Arc Touch yet.
Here is more information about the Microsoft Arc Touch mouse:
http://store.microsoft.com/microsoft/Arc-Touch-Mouse/product/000F2B35
I prefer Microsoft products myself. While I have no problems with my existing mouse, I wanted something that had a smaller nano receiver instead of the large USB dongle that I currently use. Also, it is good to have a backup mouse just in case it gets lost or stolen.