Yer welcome!
Just went through all this mice-elf (exploring the possibilities - not really doing anything yet) - as I have two instances coming up where I'm going to need to do some serious file-sharing with PCs. Networking my MacBook Pro with a drive attached to it, and using a thumb drive in the other instance are the way I've decided to go. Reformatting drives in FAT32 ended up far from my first choice in either case.
BTW - which MyBook is this? Stay away from the 1TB one. As I posted somewhere else in this forum, a friend of mine was told by WD support that those drives have been nothing but trouble, and he advised my friend to return it and get the 500 GB version instead. (This, after 3 hours on the phone with various levels of tech support!). I've also read quite a few complaints from Mac users about them, so I hope yours works as you expect.
and it was on sale... so i said "heck why not!"