Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
ShadowFox - This project aims at creating a universal dark theme for Firefox while adhering to the modern...
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
automaticDark - Time-Based Theme Changer - Set Firefox to change the UI to a dark theme during the night and change back to a light theme during the day!
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
Night Owl (Firefox Theme) - The ultimate dark and white themes for Firefox!