Anyway, the letter is online - though I'm a bit confused that it's dated April 2007 online and I'm just receiving it. I would guess that it has something to do with the fact that since then I moved from Cincinnati, to Troy, OH, to Springfield, MO, back to Troy, OH, then to Helena, MT, before finally arriving here in Reno.
In any case, while IBM lost my personal information, it is nice that they tracked me down, and they're providing me with a free credit monitoring service if I choose.