[mdip]

Hmm; Maybe I'm not a power user of Office 365 Outlook, but I'm on openSUSE Tumbleweed, running Firefox and that's all I use for work e-mail. I think I have Chrome and Chromium on here, but I haven't used them in months.

At this point, if the OS wasn't an issue, I wouldn't use the full client, ever (for all of the reasons others have provided). The only gremlin I've encountered, routinely, is a situation where the rich editor doesn't see a "space" until I've typed a character after it. It's mildly distracting at worst, and far less of a problem than typing and having the thing just sit there like it'll get to my input as soon as the spirit moves it.

On that note, really, all of Microsoft's web products have been pleasant to use. They've become good enough that I rarely end up in the LibreOffice equivalents. The "Teams" client for Linux (in Preview; I run the Insiders version) integrates well -- clicking links from my calendar opens meetings. Some things are a little off, but are a few settings away from being ideal for me. It's lacking some of the features of its more developed Windows client, but it isn't as bad as the mac Lync client was back when I last had an opportunity to experience Microsoft's conferencing platform on non-Windows.