Aerion is described as 'Open-source email client with unified inbox, IMAP/SMTP, OAuth2 support, conversation threading, TipTap rich text composer, contact sync, dark mode, and keyboard shortcuts' and is a Email Client in the office & productivity category. There are more than 25 alternatives to Aerion for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best Aerion alternative is Thunderbird, which is both free and Open Source. Other great apps like Aerion are Betterbird, Microsoft Outlook, Evolution and Mailspring.
Historically, Icedove was a re-branding of Thunderbird by the Debian project, with minimal modifications, in order to resolve branding disputes. Debian since discontinued Iceweasel in February of 2017 after reaching an agreement with Mozilla over the use of it's trademark.
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