Building an encrypted calendar is at the top of our to-do list right now as we desperately need a solution to schedule and share calendar entries securely ourselves. However, first, we have to finish the new client to push it our of beta and update the Tutanota Android and iOS apps so that you can use your encrypted mailbox with very good speeds and many more features on all your devices. Once we are done with that, we will build the encrypted calendar.
Thank you very much for your continuous support.pathetic commented
This is pathetic. First it was planned for the 2nd half of 2016, then first half of 2017, then second half of 2017 and now first half of 2018. If you don't know when, just fucking say that you don't have an ETA.