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Thunderbird for Android 8.0 Takes Flight - The Thunderbird Blog
(blog.thunderbird.net)
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Exchange ActiveSync is a licensed protocol. If any FOSS app handles it for free I'd love to know.
Evolution in Linux does.
What's the use of active sync ?
ActiveSync is to Exchange as IMAP/POP3 is to other email providers.
So if you want your email client to speak with an Exchange server you're using ActiveSync, not other protocols used by other types of servers.