Syncing iPhone to new computer/multiple computers

[digiphantom]

Hello,

I've recently purchase a new macbook air. I still have my macbook pro early 2008. However, when I try to sync my iPhone to the mba, I get the error message:

iPhone is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library?


I followed the steps here, but either I missed something or something has changed:

http://www.theiphoneguru.net/2011/0...d-and-ipod-with-multiple-computers-mac-or-pc/


also I seem to have a file called: iTunes Library.xml

But there's also iTunes Music Library.xml and iTunes Library.itl

Also I don't think HexEdit works with Lion.


I usually only manually manage my files and sync.

Any suggestions, thanks.