iTunes 10 for Windows: Move items to another computer
If you get a new computer, you can transfer your iTunes library by connecting computers or by using a portable hard drive or iPod.
For more information, click the links below to see articles on the Apple Support website.
If you have an iPod, iPhone, or iPad with iTunes Store purchases on it, you can use it to move your purchases to other authorized computers. You might want to do this if you regularly use more than one computer (at home and at work or school, for example) to buy items from the iTunes Store, and you want all your purchases in both iTunes libraries.
To copy iTunes Store purchases from your iPod, iPhone or iPad to a computer:
Connect the device that contains the items you want to transfer to the destination computer.
Make sure the destination computer (the one you want to transfer items to) is authorized to play iTunes Store purchases (choose Store > Authorize Computer and then click Authorize).
Do one of the following:
If the iPod, iPhone, or iPad is synced with another computer, or is an iPod shuffle: Click Transfer Purchases in the window that appears.
If the iPod, iPhone, or iPad is set up to manually manage items: Select the device in the iTunes window (below Devices), and choose File > Transfer Purchases From iPod (or iPhone or iPad).
Unless the song is an iTunes Plus version, you can play an iTunes Store purchase on up to five authorized computers.
Before you sell or give away a computer, don’t forget to deauthorize it (choose Store > Deauthorize Computer).