<A target="_blank" href="http://jyriver.blogspot.com/2009/04/answer-archiving-view-indexes-size.html">Jean-Yves Riverin has a user with 25,000 documents</A> in his Inbox which resulted in a huge Inbox View. After checking documentation, and running some tests, he created a script to clear old documents from the Inbox so the View could be rebuilt.