I don’t use windows or ios bit I recommend thunderbird on windows, k9 mail on android and canary mail on ios. Others are mostly store your emails in their unsecured servers and sell your data

Thunderbird on Windows and Outlook on mobile (Android though).

It will always be strange to me why people use email apps on Windows. I haven’t willingly used a desktop email program since Yahoo mail was introduced back in the day (then on to Gmail, etc.)

What do people do with email that the web client isn’t enough?

(edit) - And just to add, OP check out Thunderbird, Mozilla’s (maker of Firefox) email client.

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Thunderbird on Windows, I have used it as far as I can think back (10+ years).

On Android currently FairEmail because the native Gmail app sucks. But it’s very much a power user app that’s a bit complicated at first, but then works like a charm (It also has a one-time purchase of $5.99 for extra features, no ads, no tracking, no data sent to the app developer).

I just use the outlook web client on Windows, but I use Edison on iOS. I used Spark for a while but then they made a bit of a crappy design decision on the app. Edison has been a better choice anyway.

Personally use FairEmail on Android, and Claws Mail on desktop. Both FOSS clients with encryption support.

Those of you that like Thunderbird, Betterbird is a hardened fork of that. I use it for calendar/CalDAV purposes.

Thunderbird on Desktop, K-9 on Android

Thunderbird on Desktop and K-9 on mobile

Kmail on desktop and the native sailfish email client on my phone.

My external website/server hosting provider uses a pretty much uncustomized RoundCube web interface. this works wonderfully well on computer and mobile.