The dedicated Protonmail community deserves a real response from the crack team of Protonmail scientists and engineers. When are you implementing Yubikey or are is your tag line just bs?

"We are scientists, engineers, and developers drawn together by a shared vision of protecting civil liberties online. This is why we created ProtonMail, an easy to use secure email service with built-in end-to-end encryption and state of the art security features. Our goal is to build an internet that respects privacy and is secure against cyberattacks.

We are committed to developing and widely distributing the tools necessary to protect your data online. Our team combines deep mathematical and technical knowledge from the world's top research institutions with expertise in building easy to use user interfaces. Together, we are building the encrypted communication technologies of the future."

Love that you guys created an encrypted Calendar - but what's the point of it if the only way to use it is to log in on the PM web version? There is no sync, no push notifications, and worst of all it's not available on mobile.
I think most of us use calendars on our mobile devices.

So PCalendar should either have a standalone app, or at the very least be integrated into the PMail app.

Better yet, is there any way to integrate/sync calendar data into a device's other third party calendar app?
For example, I've been using Fruux to keep my contacts and calendars in sync on multiple devices. I can add a calendar event in, say, Android's native calendar app, then it'll sync up with Fruux, and push that event on to ALL my other calendar apps (Fantastical on iOS, Thunderbird's calendar plugin, etc etc etc).
Thank you

Creating a new address under the Protonmail Account should not be permanent. Needs change over time. Higher subscription levels appear to have the capability to delete disabled addresses provided there are no emails for it. As a Plus user, it appears that any address I create is permanent and can only be disabled but not deleted. If I created an email address for a temporary purpose, but now would like the slot back for a new address (only 5 for base Plus subscription), it is not possible. That address forever takes one of my 5 address slots whether I enable or disable it. If there is already a way to delete it, the procedure is not clear.

Seriously ... I HATE GOOGLE RECAPTCHA! Because I actively try to prevent Google tracking me (I've disabled practically every Google domain I can find using my /etc/hosts file), Google is not really aware I exist on the net. As a result, I HAD TO SOLVE TEN--count them--TEN DAMNED CHALLENGES to sign up for this site! (I'm given to understand the following things about ReCAPTCHA: 1) Google does not present as many challenges if it has seen your IP address often, which it won't for me because I actively block them; and 2) the ReCAPCHTA code sometimes presents challenge after challenge even after it's decided you're not human, probably to frustrate the bots.)
Counter to what your web design team thinks, there ARE other ways to tell humans apart from computers! DON'T USE reCAPTCHA!
2. WHO DESIGNED THIS DAMNED FORM?? It's got a bloody small dialogue THAT I CAN'T RESIZE IN FIREFOX! (for Linux.) Kindly inform your "user experience" idiots that tiny dialogue boxes are a pain in the ass to work with.

Team, Please you're killing me. We opted to have Protonmail be the backend of our domain's mail system and so Migrated in the understanding that the ProtonCalendar functionality would work like other calendars. Imagine our shock when we had to resort to using normal imo non-secure non-encrypted Calendars while you add standard Calendar functionality to ProtonCalendar. Please urgently fix this as with ProtonCalender the way it is, we are unable to accept invites ( calendar.ics files ) or send Invites from ProtonCalendar to meeting attendees. Having super secure ProtonMail email, but resorting to a standard calendar is a vulnerability that is hard to explain to our clients.