Zimbra Desktop Alternatives

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Mailbird is the best email client for Windows 7, 8 and 10

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

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Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

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.

freemium

multi-channel inbox service for collaborative teams

Airmail is a lightweight and lightning fast mail client for Mac.

Mailspring is a mail client for Mac, Windows and Linux.

Open Source

Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.

freemium

Shift is the ultimate email client for managing Mail, Calendar, Drive, Slack, Asana, Jira, Evernote, and all your other favourite apps

freemium

The Power Email App for busy professionals, like you.

With BlackBerry Work, mobile users can securely access enterprise email, calendar, contacts, and apps for work.

K-9 is an opensource email client making it easy to chew through large volumes of email.

Amazon WorkMail is a secure, managed business email and calendar service.