I plan on transferring my iTunes folder from my PC to a new 27" iMac when the refresh happens so I can get the music and iTunes to work seamlessly between the conversion. I plan on using Drop Box. I went to the iTunes folder on the PC and saw that there is a folder called "Previous Libraries". Three questions: 1) Can I delete the libraries or do I need to include these when I transfer to the iMac? 2) When exactly are these libraries saved here. the dates are so sporadic 3) What is the purpose of the previous libraries?