I've recently given up an old email address which I no longer used, except as my contact point for OTN. This meant that I also had to give up my OTN account because the security software for OTN does not let you change your email address. It doesn't matter that much, but it means I have lost all my brownie points and my little gold medal for being an active user.
It is very annoying however. The forum software they use allows email addresses to be changed out of the box but they have modified it to disable this. I thought at first it was part of the move to a single sign-on approach to bring it in to line with metalink where your email address is your userid. But no, metalink allows you to change your email address even though it your userid.
And don't get me started on the fact that you can't change your password either.
The "Editor-in-Chief" of OTN says it is out of his hands.