I had an experience similar to that. Many of my friends signed up for Google Chat back in the early aughts, so I got myself an account and added it to my IM client.<p>For a couple years, everything was great... but then, over the course of a few months, I got a weird, uncomfortable feeling like some of my friends might be shunning or excluding me. I'd hear about events having happened which nobody had bothered inviting me to, or I'd email people I thought I was close to and they wouldn't respond at all. Just odd.<p>Eventually someone asked me why <i>I</i> wasn't responding to <i>their</i> emails, which I had never received, and we worked out the mystery. Google, in their infinite wisdom, had decided to integrate Google Chat into GMail. As part of this process, they integrated the account databases (this was years before the unified Google Account came along), and as part of <i>that</i> process, they created a new GMail account for every Google Chat user who didn't already have one.<p>In a forehead-slapping bit of hubris, they then inserted this new <my-gtalk-handle@gmail.com> address into all of my GMail-using friends' address books, where it would pop up in place of my <i>actual</i> email address whenever someone typed my name in the "To" line, and voila: <i>months of messages</i> were silently diverted into a spurious account I didn't know about and never wanted.<p>I have never used GMail, ever, but that zombie Google Talk address haunts my friends' address books to this day. Just a couple of weeks ago, a friend wondered why I hadn't responded to his holiday party invitation... sure enough, @gmail.com had swiped the message, and I'd never seen it.