My Iphone was sync with Itunes on a computer then this computer broke down and i purchased another one. I was able to extract all the data from the old one. now how can i sync my phone with the new tunes without loosing any data?
Yes, windows to Mac too.
iTunes: How to move [or copy] your music [library] to a new computer [or another drive] - http://support.apple.com/kb/HT4527
Quick answer if you use iTunes' default preferences settings: Copy the entire iTunes folder (and in doing so all its subfolders and files) intact to the other drive. Open iTunes and immediately hold down the Option (alt) key (shift on Windows), then guide it to the new location of the library.
Windows users see tip at: https://discussions.apple.com/message/18879381