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⇱ Thunderbird Expanding Microsoft Exchange & Protocol Support For 2026 - Phoronix


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Thunderbird Expanding Microsoft Exchange & Protocol Support For 2026

Written by Michael Larabel in Free Software on 18 December 2025 at 09:41 AM EST. 29 Comments
Beyond the Firefox browser to see more changes under its new CEO, the Thunderbird mail client is also expected to see some big changes in the new year.

Thunderbid today published their 2025 year in review while also offering a look ahead to 2026.

This year brought Thunderbird 140 as their newest Extended Support Release (ESR), native Microsoft Exchange email support in Thunderbird 145, continued work on their mobile story, and also the introduction of Thundermail and Thunderbird Pro.

👁 Thunderbird 140 ESR on Linux


For 2026 they are working on updating their aging database solution used by the mail client, expanding their Microsoft Exchange support, expanding their protocol support, and refreshing the Thunderbird Calendar user interface.

More details on the Thunderbird 2025 accomplishments and early planning for 2026 can be found via the Thunderbird Blog.

Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.