The Mac Poser SR's have been released at the same time as the PC SR. (or within a few days). Strangely Daz is still using .sit files which are no longer used on the Mac, without 3rd party software. They should be zipped just like the PC. The main problem with moving to the Mac, is that a lot of people don't understand there is NO difference between the PC files and Mac files for content. Many venders still include strange and archaic instructions that you just have to learn to ignore. When in doubt follow the PC instructions. I have noticed that PC users have become very defensive of late and I have no wish to start a flame war, but to answer the why question I will use a simple Boolean test. A new Mac can run all the current Mac software AND Windows and all the Windows software. So buying a Mac you lose nothing and gain the best of both worlds. There are many many other reasons people would buy a Mac, check out apple.com for more... Also note that while the press and computer industry would like to use small % increases for Mac growth, these increases amount to millions of real life people that are now choosing a Mac for their next computer. This trail is well traveled and you will find lots of help along the way. PS Rendo has a Mac forum.