I recently moved some of my older tv series purchases to an external hard drive as my iTunes library hard drive was getting full.  Now, when I connect my iPhone and iPad to iTunes, I get the message that my iphone is synced with another library! Help!

I didn't rename my iTunes library or anything.  How can I sync with iTunes without erasing all my apps, app data and settings/messages etc on the iPhone/iPad?

If you moved your iTunes library by simply copying it to another drive, you may not be able to access your music even if you reconnect to that library, you may get a lot of "not found" errors because the music is not where the library thinks it should be. First thing to do is put it back where it was.  Then reconnect it. Then follow the steps in this link:
http://support.apple.com/kb/HT1364

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