I just sent an email to all of the Forgotten Futures users who weren't covered by my previous emails - those who weren't registered for the last release of Forgotten Futures so weren't contacted about getting a refund - to tell them about the changes and point out that they can get the last release of the FF CD-ROM free. In all it's about 300 people, give or take a few. So far 86 88 90 messages have bounced because the email account they registered with no longer exists!

The moral of this, I think, is that it's a VERY good idea to have an email address that isn't tied to your job / college / etc. for long-term purposes such as product registration...