Earlier today I was doing some research and came across this article on OABInteg. Henrik Walther who is an author and contributes heavliy to the MSExchange.org, has done a great job showing some of the potential that OABInteg has for solving OAB Generation issues.

If you have the time, please check this out. http://www.msexchange.org/articles/Offline-Address-Book-Integrity-OABInteg-Utility-Explained.html.