@kirschner OX home page: “With more than 220 million users, and a global customer base including some of the biggest telcos and hosters in the US and Europe, Open-Xchange is the largest independent email provider in the world.”. They shifted from one american mega corp to a medium sized german one championing open source solutions. Sounds good but then I read about the adoption of (Google) Mozilla Thunderbird. I can not believe no better open source email client is available on the market.