| | archiving SMS conversations
Good news / bad news.
There is a solution that does it - though, they currently have shut off all downloads while they fix a particularly difficult to find bug.
I've just found out about it, so have not been able to download, or try the solution, though, it says it does what we all want (uh, NEED!).
Also, it doesn't look like it does this for stuff before you install their software... but can't be sure. I hope it does.
On their front page, make sure to click the link that says "for blackberry users" - it tells you why they're not available (though the page isn't dated, so can't tell when this started, or what their timeframe is).