Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Berkanan - Chat with people nearby. Even offline, on an ✈️.
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.
Roomvine - Chatrooms for real life venues, neighborhoods and events