1. Close iTunes.
2. Copy the ENTIRE iTunes folder from the computer to the NAS.
3. Hold and launch iTunes. Continue holding until the box appears asking to create a new or locate a library.
4. Point iTunes to the iTunesLibrary.itl file on the NAS.
5. Close iTunes.
6. Move the existing iTunes folder on the computer to another location or simply rename it.
7. Launch iTunes and ensure everything is working properly.

Tags: iTunes, NAS