Very helpful post by by Robert J. Ambrogi to Legal Blog Watch:
"Every lawyer [& paralegal] who uses Microsoft Word should take a few moments to read ‘Staying on Track with Track Changes,’ by legal bloggers and technology pros Tom Mighell and Dennis Kennedy, appearing in the current issue of Law Practice Today. As they point out, the ‘track changes’ feature in Word is an enormously useful tool when lawyers are collaborating on a single document. But it amazes me how many lawyers fail to realize that this entire history of collaboration can end up being stored invisibly in the document as metadata."
See more info about keeping metadata private in this Estrin Report post.