iTunes library sync between two computers I have two computers (iMac and a Macbook Air). Whenever I try to sync my iPhone to the Air it will remove all my data. 

Is there any possibility to have a common sync mechanism in between my two computers (or especially iTunes libraries) so that I can sync my iPhone without any problem.
The only way to do this, according to Apple, is to set the devices to manually manage content. If you have auto-syncing enabled, it can only be connected to one computer.


  You can manage your iPhone, iPad, or iPod with multiple computers1,2 as long as you have set the device to "Manually manage music."


Source: http://support.apple.com/kb/ht1202