To activate your SPAMfighter product key please do the following:
* Open your email program (Outlook, Outlook Express, Windows Mail or Thunderbird).
* Locate the SPAMfighter toolbar
* Click More -> Enter Product Key
* Enter your product key (you can find the product key on your invoice):
* Click Add Product key to save your product key.

If the Add Product key button is not clickable, after you entered your product key, it means that the product key has been entered incorrectly. To avoid typos simply mark the product key, copy it and paste it into the first field.

* Restart your email program and SPAMfighter will be upgraded  to the Pro version.