I have looked and looked and can not find the name of the Business Status rebuild program and can't remember it either.  I ran it once in test.
I am wondering if I can create a copy of my current  company, and reset the date for January, then run rebuild.  That at least would clear out bad data from 2005 and I would still have data for 2006.  Not that it would all be correct, but it might be more correct!
Would this work?