I also noticed that it still can be purchased, along with several other products that are "phased-out". The difference may be full vs "activated TBYB". With full versions they send the serial number to you in your confirmation/download email.
To email corel, you need to first go to their
Knowledge base. Click on one of the subjects, and there is one or two concerning activation. Clicking on an answer should reveal a tab that states
Email Corel.
Click on image to enlarge
I think that Corel MediaOne replaced PhotoExpress. Corel also has PhotoImpact, and their flagship program Corel Draw Graphics Suite.