For others looking at this post this is the response I got:
"This serial number is from the extension library which was discontinued over 2 years ago and is no longer valid.
To continue using the Universal Email functionality, you will need to upgrade to Data Bridge."
You just lost a customer. Keeping someone from using a product they paid money for, and then forcing them to buy an expensive package full of stuff they don't need to get what they already have is extortion. The whole concept of bundling everything into two packages and not supporting your past customers may have made sense in a corporate boardroom, but I hope in the real world you lose money like crazy. Take Windows XP as an example. It's not supported with updates, but I can still install it and use it. Hell, I can reinstall Windows 3.1. I don't expect support for it, but I can use it if for some odd reason I wanted to. I will definitely be spreading the word to my colleagues.