Here's the email I got from them:
You are receiving this email because you registered on www.bmw-forums.com. If you haven't visited in a while a lot has changed. We had to change the name of the site to www.bimmerwerkz.com due to legal threats from BMW.
We have just upgraded the forum software and will be adding more features in the coming weeks.
If you are having problems logging into the new forum please use the "forgot password" utility at http://www.bimmerwerkz.com/forum/login.php?do=lostpw
If you have any other problems please post in the Site Talk forum (http://www.bimmerwerkz.com/forum/forumdisplay.php?f=11) with a description of the error/problem.
This email is once off, there is no need to unsubscribe or ask to be removed.