While I do the best I can to make sure that a working promotional code is filled in to the Mozy signup form there are times when either the promotional code has not started working or has expired. You can easily test to see if the Mozy promotional code is valid simply by clicking on the “Continue” button on the Mozy signup form. If the code is not currently working it will produce an error on the form. If there is no error the promotional code is valid and you can use it to save on your initial purchase of Mozy. You can then fill in the rest of the form to signup.
Here is a quick video showing you how to test if the promotional code is valid.