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Pro Beautiful interface, customisable to your needs
Pro The only email client which synchronizes Gmail contacts properly
Pro Many useful options
Such as sorting through categories, etc.
Pro It doesn't store all emails on the disc
It saves space, unlike Thunderbird.
Pro It's simple to add new accounts
Pro Free and paid version
It is free for 2 accounts and as long as you don't use it commercially. Paid version comes with support and can handle more than 2 accounts.
Pro Calendar inclusive
Pro Chat included
eM Client includes integrated chat, so you don't need another application for chatting with your friends. All common chat services supported (Google chat, Jabber and others).
Pro A perfect companion to your Gmail or other webmail you might have.
It provides (almost) complete Gmail functionality (calendar, tasks, chat, contacts), while offering advantages of an application: offline use, more e-mail providers in one place, very good design, support, etc.
Pro It is still the best in this class
But only because it has no alternative.
Pro Very fast
Con Account options are not shown under right click
Con Only has one nice interface/skin
The other available skins has a 90s feel to them.
Con Not many options to manage IMAP folders
For example, all emails from Gmail will unnecessary synchronize.
Con Constant syncing errors
Con Interface is too simple
Many options are too hidden and it takes at least 3 clicks to set them up.
Con Terrrible in handing unread emails
Sorting of unread emails is very useless when compared to other email clients.
Con Muy lento al procesar varias cuentas de mail
Cuando se programan varias cuentas de mail se vuelve insufriblemente lento, al punto de tildarse el programa y tener que reiniciarlo. El sistema donde está instalado es bastante potente (Intel i5, MB Asus, 16 GB Ram) y aún así va muy lento. No ocurre lo mismo cuando está configurado con una sola cuenta de mail.
Con Poor integration with Yahoo Mail
Integrations with a Yahoo Mail account doesn't always work well in eM Client.