This is a tip provided on the Macintosh News and Information List (Mac-L) list . It’s specifically for Entourage X, but the process might be useful for other versions of Entourage. Please send your feedback on your results if you try this method by leaving a comment.
Note added April 2009: This applies to any version of Entourage when trying to rebuild. The more space you have the more likely it will be successful. . . .
Continue Reading: Rebuilding a damaged database that exceeded size limit