dont worry you can get a new key generated by microsoft for free.
open this link and follow the appropriate steps as given by microsoft to get a new key for your office product.
let me know if you need any help.
This does not help. I have a product key, but it does not seem to be valid. Why should I pay more to get a new product key?
you do not have to pay any more
did you open the link to follow the steps
yes, they say it may cost more. There is no mention about what to do if you have an invalid product key.
I called microsoft directly and they helped me. Your help was not useful.