KDE 5 + kmail for me.

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Openbox and Mutt.

Openbox because it's relatively light on resources and extremely stable. My WM usage went from Blackbox in the late 90s to early 00s, then Fluxbox until around 2007, and finally Openbox to present day.

Mutt because it's what I've used for the last 15+ years and I haven't had a reason to change.

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Fluxbox. It does what I need without getting in my way.

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fvwm2 xterm elm netscape and acroread. Anything else I code in perl.

I've had to modifiy some of these recently :-( so I use firefox and claws-mail.

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I use WindowMaker as my window manager. It is light and quick to start. It allows me to use my dual monitors on my desktop as I want. On my little netbook, the dock icons are easy to select, despite using a trackpad on a moving train during my daily commute. On my work Windows machine, I have cygwin installed and use WindowMaker there, so I have a constant user experience. The interface looks a bit quaint with sharp corners compared to modern design, but can be softened by adding compton. Over time I have accumulated a set of keyboard shortcuts and custom menus that allow me to do what I want very efficiently. If you add wmsystemtray from SBo, then system tray apps like nm-applet and orage are easily used.
Like others, I also use webmail.

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I eschew webmail.

I use Seamonkey mail on my Mint box (because of the integration with the browser) and Mutt on my Slackware box.

I find managing email in my browser to be clunky, but that's just me.

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I regularly switch between Fluxbox, wmii, dwm, Xfce, WindowMaker and ratpoison. For every day use I stick with Xfce. For productivity I run Fluxbox. However, I am a recent KDE convert and am happily enjoying the DE integration of all the applications.

EDIT: For mail I use Thunderbird + Enigmail.

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Fluxbox wm.
Emacs rmail-mode for email.

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When I was using text-based email, it was mutt, getmail and msmtp.

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On my desktop, mostly fvwm. On my laptop, xfce.

Been using fvwm for almost 20 years now. Sorta comfortable
with it.

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I'm using KDE4 at the moment. Before that I used windowmaker. Before that some old version of gnome. I didn't care for old versions of kde. Gnome and KDE about 13 years ago I thought were buggy (I was new to linux at the time so maybe it was me). I haven't used gnome since slackware dropped support but since Slackware 14.1 I've liked KDE. Its very polished. It requires a lot of resources on my p7807u fx but I can run as much as I want without issue. I can control the volume with my laptop buttons which is nice. Its just the mounting system for udisk2 that confuses me still.

How is KDE5 compared to KDE4? I'm scared to switch because I got it setup like I want it at the moment.

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My WM of choice is xmonad. It is stable and fast.

Heavily modified 'dwm' for window manager.

Mutt for Mail User Agent.
OpenSMTPd and fetchmail for Mail Transfer Agent.

Rationale for 'dwm': No dependencies outside of Xlib. Simple to modify 'C' source, gets out of my way during use.
Rationale for 'Mutt': primarily the 'limit' filters.
Rationale for OpenSMTPd: not wanting to deal with the ugliness that is sendmail.cf files.

i3 wm, zsh (with oh-my-zsh)

Same here, never liked KDE, don't even install it anymore. Used Fluxbox/Blackbox in a past life, but since years XFCE does most things so much better.