This useful and easy to use utility stops you having to buy or install iWork '09 just for this simple task. It will also batch migrate of files from Numbers 08 to Numbers 09. If you do not have Numbers '09 on Mavericks (OS X 10.9) or Yosemite (OS X 10.10) then you will be stuck. Or perhaps you have the install media for Numbers '09 but no CD Drive in your Mac anymore? You can only solve this problem by spending lots of money on hardware and software you don't really need. If you have an old Mac with Numbers '09 you would have to spend time dusting it off and getting it to work again. Or you could just use this converter. Fast and quick, and your problem is over in seconds.