Can I sync my iphone with another itunes library without deleting everything?

The computer I originally set up my iphone with is dead and gone. I want to add new stuff to my phone without deleting the music from the original library. Is this possible? If so, how?
Details please!

Yes you can as I've already done on my I pod.
As itunes will only scan for data without deleting it.

  • Will deleting my iTunes library erase it from everything? I recently got an apple computer and have been switching everything over from my pc. Once done, I'm giving my old pc to someone else so I want to make sure none of my old stuff is on it. I have already imported my iTunes library to my apple computer so I want to get rid of it on the other one. If I delete all the music in the library on the windows, will it also delete from the mac and my other devices it's on? Like my iPod and phone?
  • Unlock iphone without deleting everything? So I lost my iphone like a year ago, I found it finally. But I can't remember the passcode. Is there anyway to get past it without deleting and resetting the phone?
  • Is there another way to sync my iphone to my computer without itunes? I updated my iphone to the latest iOS and my mom won't download the newest version of iTunes. Which is what I need to sync my phone. I don't know why she won't download it but she won't. So is there anyway at all (preferably free) to sync my iphone to my computer without itunes?
  • If I sync another iphone to my iTunes will this delete my previous sync on iTunes? I synced my phone to iTunes and now let's say I want to sync my friends iphone to the same computer. Will this delete my previous sync? I'm hoping it does because I want my previous sync deleted as I don't want others getting my stuff on their iPhones thanks heaps