By their count, U.S. and U.K. workers on corporate laptops are more than twice as likely, compared with desktop users, to send confidential info by instant message, and about a third more likely to send confidential data across Webmail.

FORBES: Accounting For Human Error

A. wrote last year on College Confidential, an online message board, "It's not like Johnny is going to be at the cusp of committing fraud and then think back to his b-school days and think, "gee, Professor Goody Two Shoes wouldn't approve.

WSJ: Some B-Schools Step Up Efforts to Tie Ethics to Business Programs

For instance, when every message from a sender's account is tagged with "privileged and confidential, " it might make it difficult to convince a judge that any one email is more private than another.

WSJ: Email Disclaimers Proliferate