"Sorry" is probably the hardest word to say in the English language. So, it was especially intriguing to hear a software company express regret to an unhappy customer. Here's the background: Recently, Design News attended a "blind" focus group held by PTC, to find out how customers feel about the company's products. While much of the feedback was positive, one engineer spoke up to complain of a run-in with a PTC salesperson, saying she now had negative feelings about the company. When the focus group was over, a PTC executive called the engineer to personally apologize for the salesperson's actions. The engineer accepted the gesture. Will she buy more PTC software? No one knows. But at least she got something many people never get in their professional lives: An apology.