I keep seeing merchants and freebie authors post that conversion is required for Mac users to use PC items in Poser 5 & 6 format. Poser 5 & 6 have the identical format in Mac and PC. Conversion between Mac and PC has been totally unnecessary since ProPack. The only exception is if RSR files are used to replace PNG, PICT, etc. The same is true for PC, but it's automated in PC, and that is Poser 4, after all. Mind you that conversion in most cases doesn't damage the Poser 5 & 6 files, since it doesn't see a need to convert and merely rewrites it as is. This applies for both PC files going to Mac and Mac files going to PC. They are 100% compatible. So if someone creates something entirely in Poser 5 or 6, the PC to Mac conversion notice needs not be present. Only if parts or all of the items were created using Poser 4 or Pro Pack or earlier do the files need to be converted.