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Thunderbird 154 Released with System Tray Mode, Microsoft Graph Support, and Major Mail Fixes

1 week ago
by George Whittaker

The Thunderbird team has officially released Thunderbird 154, delivering several useful new features alongside a substantial collection of fixes for email, calendars, address books, authentication, and stability. Released on August 18, 2026, Thunderbird 154 is now the latest monthly release of the popular open-source email client.

For Linux users, one of the most interesting additions is a new optional system tray mode, while Microsoft 365 users gain Microsoft Graph support. The release also improves global search, attachment handling, IMAP reliability, Exchange authentication, and CalDAV synchronization.

New Optional System Tray Mode

One of Thunderbird 154's most welcome additions is an optional system tray mode.

When enabled, closing Thunderbird's last window no longer needs to completely terminate the application. Instead, Thunderbird can remain running in the background through the system tray.

This can be particularly useful for users who want Thunderbird available throughout the day without keeping its main window open.

For Linux desktop users, the feature could make Thunderbird feel more like a traditional background email client, especially on desktops where tray-based applications remain part of the normal workflow.

Microsoft Graph Enabled for Microsoft 365

Thunderbird 154 also enables Microsoft Graph for Microsoft 365.

Microsoft Graph is Microsoft's API platform for accessing Microsoft 365 services and data. Its integration is particularly important as Thunderbird continues improving its support for Exchange and Microsoft-hosted email environments.

Thunderbird has been steadily expanding its Microsoft ecosystem compatibility, making the open-source client increasingly practical for users who need to access workplace Microsoft 365 accounts from Linux.

Global Search Gets a Useful New Option

Thunderbird's global search functionality also receives an improvement.

Users can now configure global search results to open in list view by default, providing another option for people who prefer a more traditional message-list workflow when reviewing search results.

It's a relatively small addition, but one that can make repeated searches more convenient for users managing large mailboxes.

Better Attachment Management

Thunderbird 154 introduces several improvements for handling email attachments.

A new "Copy To" folder context menu has been added for message/rfc822 attachments, and these attached messages can now be dragged directly into Thunderbird's folder tree.

These changes should make it easier to organize attached email messages without having to use additional steps or workarounds.

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George Whittaker

FCC Abolishes Gigabit Speed Goal, Suggesting It Is Unfair To Slower Technologies

1 week ago
An anonymous reader quotes a report from Ars Technica: The Federal Communications Commission last week eliminated the gigabit speed goal established during the Biden administration and declared that current levels of broadband deployment in the US are acceptable. Though fiber networks have routinely offered such speeds for years, the FCC said the gigabit speed goal is not "technologically neutral," suggesting that it isn't fair to other, slower technologies. In 2024, the FCC raised its broadband benchmark to 100Mbps downstream and 20Mbps upstream, setting the new standard by which to judge whether deployment is reasonable and timely. The FCC at the time also set a long-term speed goal of 1Gbps download speeds paired with 500Mbps upload speeds, saying it would use the goal "as a guidepost for evaluating our efforts to encourage deployment." Republican Brendan Carr, who is now the FCC chairman, never liked that long-term goal. He proposed abolishing it last year, and the change was finalized on August 14 in the FCC's latest broadband deployment report. The reports are mandated by Section 706 of the Telecommunications Act. "As part of our return to following the plain language of Section 706, we adopt our proposal from the Notice [of Inquiry] to abolish without replacement the long-term goal of 1,000/500 Mbps established in the 2024 Report," the order said. "A long-term goal is not mentioned in Section 706 and could appear to violate our obligation to conduct our analysis in a technologically neutral manner. At present, it is impossible to predict long-term technological developments and the evolution of consumer preferences." The FCC said that comments submitted by cable industry group NCTA and wireless industry group CTIA "support our reasoning for abolishing the long-term goal." Last year, the Brendan Carr-led FCC said (PDF) that the gigabit goal "may be unreasonably prejudicial to technologies such as satellite and fixed wireless that presently do not support such speeds." However, last week's report contradicts that stance. "We disagree with commenters arguing that our concern about technological neutrality merely serves to accommodate technologies that may currently offer slower speeds," the FCC said. "At present, we do not know the nature of future consumer preferences and, considering that the goal is not required by the statute and does not serve any positive purpose (as discussed herein), we believe it prudent to abolish it."

Read more of this story at Slashdot.

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