Can't open the illustration. The file was generated by a newer version of Illustrator and can not be opened. Please resave it in a format compatible with your version of Illustrator.There are two things wrong with this message. 1) Cannot is one word (not two) and 2) the message assumes I have access to multiple versions of Illustrator, giving me the ability to open the illustration in a newer version of Illustrator. The question I have concerning that second part is, "If I have both an old and a new version of Illustrator, why would I be still using the old version?" But, I digress.
The reason why I'm writing this blog is because there is a way around this version-compatibility problem if you're using a Mac. Preview has the ability to open any postscript file (.eps files included). Opening the pesky .eps file in Preview will then give you the ability to save the file as a .pdf. Throw the .pdf into your older version of Illustrator and voila! Opened file. There may be some formatting issues, but beggars can't be choosers, can they?
Happy illustrating.