I'm looking to sell my 001 and I want to be sure I'm providing accurate info for potential PC buyers. Anyone know if the same serial numbers work for corresponding upgrades across platforms? For example, my 001 came with 5.01 (both Mac and PC) and I upgraded to 5.1 (which says "For Macintosh")-- will that 5.1 serial work for the PC version too? If it doesn't work, will the person that I'm transferring the registration to be able to get a new serial # that works for the PC version? Also, will the same # work for the 5.3.1 upgrade? It did let me download the PC version from the Downloads page, but I have no way of knowing if they work. Thanks, c