Now that former FBI official Mark Felt has been identified as the Washington Post’s Deep Throat source, there remains only one major unsolved Watergate mystery: What were the Republican burglars seeking when they bugged the Democratic headquarters and what, if anything, did they do with that information?
One might have thought that investigators would have nailed down something as central to any crime as the motive, but the mystery surrounding the famous break-ins in May and June 1972 quickly turned to two other questions that went up the chain of Richard Nixon's command: Who authorized the operation and who organized the cover-up?
So, the Watergate motive was never nailed down. Nor was the related question: Did the Republicans make any use of the information they got from the one bug which worked between the date of the first break-in in May and the second break-in on June 17, when five burglars were arrested.
http://www.consortiumnews.com/2005/062405.html