I just tried it with Word 2002 and WordPerfect 11. I tracked changed with
Word, then opened the document in WordPerfect. The tracked changes were
converted to WordPerfect's redlining feature. It does not, however, work in
the other direction. I reviewed a document in WordPerfect; Word did not
convert the markups to tracked changes. In fact, it brought both the
insertions and deletions over unmarked.