Selecting Software Update... From the Apple menu (top left corner) will ensure that all your software is the latest version available for your computer.
No, you do not have to have iTunes 9 for an iPod Touch, but iTunes 8.0 or later is required.
itunes 9
If it does not open, try restarting your computer. If it still does not open, delete that iTunes and redownload iTunes 9 from Apple's website.
The ipod 3g doesn't exist yet; and no it doesn't require iTunes 9. even though i have iTunes 13
you can't... but if you are doing this because of your iphone or ipod not syncing, you can update your phone to keep up with the new itunes
Yes.
iTunes 9 requires QuickTime 7.6 or later. If you are running an earlier version of QuickTime you will need to update it. The iTunes installing process should let you know if you need an update but will not do it automatically.
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MPEG-4 audio files can be imported to iTunes 9. They will usually have the extension .m4a or .mp4. The AAC files that you can purchase from the iTunes store are MPEG-4 audio files.
Home Sharing is part of the iTunes 9 software and can be used free of charge.
The iPod Touch requires iTunes 9 (See links below) and will not work with earlier versions of iTunes.
I think you need at least itunes 8 or 9. I'd get 10 if I were you...