JMAP support would make a huge difference to expand the only open/free (as in speech) competition Exchange has.

It does make stuff great. Even Microsoft is trying out Rust in their shit operating system because apparently 30% of all CVEs are related to, you guessed it, memory issues. And Rust will most likely solve them all. Even the Linux kernel has Rust code in it now. If Rust was not of importance, why would the Linux kernel get rusty? Especially Linus Torvalds is very strict about these things. Sure, bad code rewritten in Rust does not make it any better than it originally was. Plus you get C-like speed with good syntax and memory safety, what more could you ask for?

Yes security issues will remain a problem no matter what language was used. You are talking about the possibility of a logic flaw being there, whereas rust 'just' prevents memory corruption.

Which is the more common security issue? Memory corruption by a mile. That's why many are excited by the rust rewrite

So you're right it isn't literally everything, but I'm not sure what would be. What would make you not fed up about it?

Maybe the issue was that you were using it to access some kind of Microsoft service and their improper IMAP implementation.

K-9 mail is better

Evolution is a good client that I used for a long time. But I switched to Thunderbird after their recent UI overhaul and I have to say it feels way more thought out and robust than evolution.

Thunderbird had it as a plugin to support EWS.

Rust is wildly fast. Learning that it is being used for a program is good to know if you care about speed. If you read the article, it even addresses your exact critiques:

Moreover, Rust has demonstrated superior performance compared to JavaScript add-ons, resulting in a quicker and more responsive Thunderbird. Furthermore, the integration of Rust into Thunderbird will be facilitated by the fact that it is already utilized in Firefox, enabling Thunderbird to leverage existing infrastructure for testing and continuous integration.

So not only with thunderbird be faster because Rust is faster than JavaScript, but it eliminates 3rd party addons by being native which also further increases speed. Lastly, development time for new features and improvements is faster because they can now use using the mature tooling that Mozilla has for Rust.

So yeah, good to know its using Rust now.

Why does every mention of Rust have to spawn these comments?

The story right after this one for me is how KeepassXC is porting to Qt6. I bet nobody has knee-jerk responded to that story bitching about the fact that they mentioned Qt. It is just the anti-Rust zealots that do this.

This article talks about the problems they were trying to solve, the tools they chose, and how those tools solve those problems. What is wrong with that?

Are you offering up informed commentary countering why you would have made different choices and why?

You do not need to attack every mention of a technology just because it threatens your historical preferences.