Old journal entries through December 2001 have been blessed to render properly in b2. However, entries from April 26, 1999 through November 2001 can still be found in the old location. They will likely stay there forever, since there's no pseudo-automated way to import them.
I am so glad I'm done with that. I'm sometimes extremely anal, and leaving this unfinished has been nagging me since the original import from Greymatter. :)