It ain’t outlook if you need that level of Corp crap but it does well with my massive mess of email from 2002 onwards over various hosting and forwards and works well with gmail.
The price has gone up a fair bit since I had to move away from Mac, so I don't know if the value proposition is still there, but I know it saved me hours of time...
Thunderbird is the closest to productive I've gotten on Windows since, but I want those hotkeys!
Kinda like getting used to drag-n-drop usually doing something sensible, rather than its fucking everything up, doing nothing, or causing a crash/state-corruption in the target program. I'd been trained by other platforms to just about never try to use it for anything except dragging files from directory to directory, and had to un-learn that.
... is Mail not OK?