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Mozilla Relents, Thunderbird Can Stay

After nearly a year and a half with an uncertain future, Mozilla tells Thunderbird it can stay and that its future is now certain — in a most uncertain way.

Mozilla Thunderbird

This is complicated. Mommy Mozilla has eased up about kicking her child Thunderbird out of the house. T-bird can stay, but must live in the basement or in the room above the garage or something — and no more free ride. From now on, it must pay its way and obey house rules.

I’m joking, of course. Well, not exactly.

You might remember, back in December, 2015, Mozilla put Thunderbird up for adoption, saying it considered the popular email client too draining, both in terms of developer time and finances. Back then, some wondered if the main reason was because email clients aren’t sexy enough in a day and age when most consumers are using web-based email — which might be closer to the truth than Mozilla is willing to admit. Be that as it may, plenty of people — myself included — still rely on local email clients, for privacy reasons if nothing else.

At the time, Mozilla executive chairperson Mitchell Baker wrote in a company-wide memo, “Mark Surman [Executive Director] of the Mozilla Foundation and I are both interested in helping find a way for Thunderbird to separate from Mozilla infrastructure. We also want to make sure that Thunderbird has the right kind of legal and financial home, one that will help the community thrive.”

Mozilla even went so far as to commission a report from well known FOSS advocate Simon Phipps, the former president of the Open Source Initiative.

“The Phipps report saw three viable choices for the Thunderbird Project’s future home: the Software Freedom Conservancy (SFC), The Document Foundation (TDF) and a new deal at the Mozilla Foundation,” Philipp Kewisch, senior add-ons technical editor at Mozilla, reported Tuesday on the Thunderbird Blog. “An independent ‘Thunderbird Foundation’ alternative was not recommended as a first step but the report said it ‘may become appropriate in the future for Thunderbird to separate from its new host and become a full independent entity.”

Long story short: Mozilla has decided to continue to be Thunderbird’s parent and not send it packing to a foster home — as long as it doesn’t have to do any actual parenting. T-bird has to find its own infrastructure — I assume that means it’ll need to provision its own servers and all that go with them — and figure out a way to come up with its own funding. Right now its answer to that is to panhandle…er, rely on donations.

“Many months of donations have developed a strong revenue stream that has given us the confidence to begin moving away from Mozilla-hosted infrastructure, and to hire a staff to support this process,” said Kewisch. “Our infrastructure is moving to and we’re already running some Thunderbird-only services, like the ISPDB (used for auto configuring users’ email accounts), on our own.”

There’s no indication about who is doing the donating. My experience is that revenue streams relying solely on donations can be difficult to maintain over time, unless the donations are tied to corporate sponsors who have a vested interest in the project.

Thunderbird must also abide by some house rules in order to stay at its old new home:

“The Mozilla Foundation has agreed to continue as Thunderbird’s legal, fiscal and cultural home, with the following provisos:

  1. The Thunderbird Council and the Mozilla Foundation executive team maintain a good working relationship and make decisions in a timely manner.
  2. The Thunderbird Council and the team make meaningful progress in short order on operational and technical independence from Mozilla Corporation.
  3. Either side may give the other six months notice if they wish to discontinue the Mozilla Foundation’s role as the legal and fiscal host of the Thunderbird project.

Mozilla would invoke C if A+B don’t happen. If C happened, Thunderbird would be expected to move to another organization over the course of six months.”

I’m not so sure Mozilla will offer a good home in the long run. However, short term, this might work out well for the email client, which relies on Mozilla’s help implementing the Gecko rendering engine they both use. Unfortunately, the browser folks have plans down the road to replace Gecko with Rust-based Servo.

“Thunderbird will remain a Gecko-based application at least in the midterm,” Kewisch said. “but many of the technologies Thunderbird relies upon in that platform will one day no longer be supported. The long term plan is to migrate our code to web technologies, but this will take time, staff, and planning. We are looking for highly skilled volunteer developers who can help us with this endeavor, to make sure the world continues to have a high-performance open-source secure email client it can rely upon.”

Those highly skilled volunteer developers most likely won’t come from the ranks of Mozilla. In December, 2015, Mitchell Baker complained, “Engineers working on Firefox and related projects end up considering the competing demands of Thunderbird, and/or wondering if and how much they should assist Thunderbird. Neither project can focus wholeheartedly on what is best for it.”

Personally, I still think Thunderbird would be a good fit for The Document Foundation.


  1. Andrew McGlashan Andrew McGlashan May 11, 2017

    Great article, thanks for the update.

    I love Thunderbird, there is not other email client that comes close to it.

    I too think that the The Document Foundation would be a better home.

    btw it would be great if you fixed tab from this field to go to the name field as a normal tab order (logical too).

  2. Juan Courville Juan Courville May 11, 2017

    From time to time I drop my donation in their hat. It has being the only email client I use for a long long time.

  3. Volt4ire Volt4ire May 11, 2017

    Can you expand on why you think The Document Foundation would be the best fit for Thunderbird?

  4. Ted Macaroni Ted Macaroni May 11, 2017

    If Mozilla would give Thunderbird 1% of 1 year’s revenue it would be a massive boost to development. Seems they don’t quite want to let it go, but they don’t want to contribute much either.

  5. Geoff Isaac Geoff Isaac May 11, 2017

    Thunderbird is supreme to any other email. Many try to mimic or throw up a challenger, but they do not come close. Have used T/Bird since 2006 and it has never failed me. You know clearly who is communicating with you and replys are simple to prepare.
    Thank You Morzilla, your favorship has just gone up 100% more. We lover the Thunderbird; it is World recognized. Australian love it. Whether you are a Microsoft user or Linux supporter, Thunderbird is part of your system.
    Keep up the support for Thunderbird !

  6. Thad Thad May 12, 2017

    Thunderbird sure doesn’t feel like it’s gotten any love these past years. Can’t even rearrange the display order of your mailboxes without an extension.

    And why doesn’t scam detection have the same options as spam detection — “always trust this sender”, etc.?

  7. tracyanne tracyanne May 12, 2017

    @Geoff Isaac

    >>Thunderbird is supreme to any other email.<<

    You are, of course, free to believe that Geoff, but clearly you have never used Claws-Mail. 😉

  8. Eddie G. Eddie G. May 14, 2017

    I love Thunderbird. I have used it for quite some time, and won’t run any other email client on my Linux machines. I do hope someone comes forward to help them. If I had the means? I’d donate a large sum to them to keep them going. My advice to them is: Find a donor that has some kind of corporate financial backing…(think Fedora and Red Hat) and then continue to make this the best email client in the FOSS World! As for Mozilla? I have a love/hate relationship with you now due to the fact that you’re behaving like this. If you don’t want Thunderbird, at least help them out for a year or two with monies that you can give them. Maybe even help them to find a new home? But don’t just toss them out!

  9. tracyanne tracyanne May 14, 2017

    Personally I couldn’t care less what happens to Thunderbird. I’ve set it up for so many people because they know about it, and it is available for Windows, but compared to other FOSS options it seems quite clumsy, and there is no way to avoid getting emails in HTML, because basically Thunderbird is a web browser optimised for email.

    I’ve hoped for quite a while now that it would get dumped and the project cancelled.

  10. buovjaga buovjaga May 17, 2017

    Mozilla did not relent. The decision was made by the Thunderbird Council. This is about Mozilla Foundation, not the Corporation.

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