RoseCity Software discontinued marketing and supporting the Courier e-mail client in April, 2009. If you are seeking technical assistance, we suggest you visit the Yahoo Courier User Support Forum for assistance.
Courier is no longer available for download from Rose City Software. We gave away free registrations for almost three years as a public service. We have not made any profit with Courier in more than 5 years. It seems most people these days are content to either use Outlook, or to use something like gmail or hotmail.
Limited technical support for Courier is still available from the Yahoo forum for Courier.