RKS Mighty Fax Software / Rude support reply!
I was purchasing the product serial number for a trial version but was not aware of 2 different versions, hence got the wrong one and asked for the correct one by e-mail. I received an extremely rude reply basically telling me that I must have been stupid not to notice this before downloading. When I complained about this rude reply, the conclusion of the answer was "... and gently remind you to not let the door hit you in the a*se on your way out".
Their product may be good but I surely do not want to support a company employing people with this attitude.