Hiri is a modern email client for Linux focused on Exchange and Office 365.
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Pro Simple and modern UI/UX design
Con Dead product
No release in well over a year, no support, and a permanent "never to be repeated" offer. This product is now looking like a con itself.
Con Not free
You have to subscribe to a paid plan to use it.
Con Cannot unsubscribe or cancel service
Cancellation requests go unanswered but the yearly invoices continue to arrive and credit card is charged.