Can I Use My Endnote Library With Different Versions Of Endnote?
February 12, 2011
Later versions of EndNote can read libraries from earlier versions. It is also possible to move libraries back-and-forth between versions of EndNote from X onwards, but remember that some features are not present in all versions (e.g. groups only appear in X1 onwards, syncing of pdfs, etc) and newer versions will offer different reference templates and styles, etc.
Those on versions X8 or earlier should upgrade to the current version for free for better performance and support.