For the last couple of month I was a happy user of FolderShare, a simple way to create a peer-to-peer network helping me to synchronize data between different machines (and also work places). The software worked just great for me, no problems with NAT, proxies, whatever. I finally decided to pay the modest fee of $49 for the extended version (better protocol, less limitations...). FolderShare has been acquired by Microsoft (something I take as a sign of quality for the FolderShare software), and I received mail from FolderShare stating that the service is now free of charge and I will be receiving a refund of my fees at a pro-rated basis.
All I can say 'Excellent', great service, I was not really expecting a refund. Thanks, keep improving the software, and I won't mind if it stays free ...