One iPhone, multiple computers

Hi,
I'm using my iPhone 3G with a few computers (office, home, laptop etc.). Each of these computer is running the latest version of iTunes. I am able to sync outlook and IE information on all machines.
The problem is that I can copy music to my iphone using one computer only, the rest won't let me copy music to the iPhone. All the music files are MP3.
Is there a way to enable music copying on more than one machine?
Thanks.

By design, the iPhone will sync itunes content with ONE computer at a time. You can sync contacts & calendars with multiple computers. If you attempt to sync itunes content with a second computer, all itunes content will first be erased from your phone & then replaced with the content from the second computer. This is a design feature.

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Hello dal1820
Check out the article below on how to use multiple devices with one computer. The main idea that I want to point out is to have different users for each person as it is the easy way to make sure that no issue happen when syncing.
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http://support.apple.com/kb/ht1495
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One iPhone, multiple computers

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