One of many reasons I loath iTunes is the difficulty in moving your iPod or iPhone to a new computer. I won’t bother with tips on moving music and such, there are plenty of blogs and sites out there to help with that. My main goal is to record for myself and others how to sync your iPhone’s apps to a new computer without losing the apps’ data and settings.
Before you do this, make sure you have a good backup of your phone on the old computer.
For those snoozing in the back, BE SURE TO BACKUP YOUR IPHONE FIRST. Caps = Important.
At this point, iTunes will give you a warning that doing this will delete all the apps and data from your iPhone. iTunes is a lying liar. If you are syncing the same apps that are currently on the iPhone, it will not delete the apps’ data. However iTunes will take it upon itself to arrange all your apps in alphabetical order. If you have a lot of apps, it will take some time to move everything back to how you want it. The important bits, the data, will be there at least. The exception to this is if the app is on your iPhone, but not your new computer. If that is the case the app and the data will be deleted. Before you sync the phone to the new computer, make sure all the apps on the phone are also on the new computer.
Finally, click Apply. After the sync, your apps and data will still be on the iPhone and the apps are associated with your new computer. You can now start moving your music and other goodies over.
Your mileage will vary. I did this from Windows Vista to 7 and it worked for me. If it did not work for you, you still are able to restore your iPhone to your last backup. You did do a backup right?