Which EndNote version to use?

You should continue to use EndNote 7 if you are sharing EndNote libraries or computers with colleagues who use EndNote 7. EndNote 9 and EndNote X are not backwards compatible with EndNote 7. An EndNote 7 library can be converted to EndNote 9 or EndNote X but an EndNote 9 or EndNote X library cannot be used in Endnote 7.
EndNote 8 had a large number of bugs and should not be installed.
EndNote 9 and EndNote X have Unicode support for non-Western languages.
EndNote 9 and EndNote X allow an unlimited number of references in a library. EndNote 7 allows 32,000 or 32MB.
The same import filters and connection files can be used in EndNote 7, EndNote 9 and EndNote X.
EndNote 9 and EndNote X can use EndNote 7's output styles. EndNote 7 cannot use EndNote 9 or EndNote X's output styles.
Endnote 7, EndNote 9 and EndNote X all allow links to PDFs with slight differences in the method. X allows easier sharing of an EndNote library's linked PDFs between different computers.
EndNote X can save an EndNote library and associated PDFs as a single compressed file.
Find out about the new features of EndNote X3.
EN X4 is the only version compatible with Microsoft Word 2010. This version of EN is also backward compatible with earlier versions of Word and EN (9 - X3) - more information about X4 is available from EndNote.