Starting with Thunderbird version 52, Thunderbird requires Mac OS X 10.9 (Mavericks) or higher. If you are on an earlier version of Mac OS X, there are options for you to continue using a secure version of Thunderbird.

Firefox Lockwise. Take the passwords you’ve saved in Firefox with you everywhere. Download for iOS; Download for Android; Support; Firefox Monitor. See if your personal info has been leaked online, and sign up for future breach alerts.

• Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users. Join Us Make a Donation. Get Support. Report a Bug. Beta Channel; Nightly Channel; The Future of Thunderbird. Experience cutting edge features.
• If you have installed Lightning, Thunderbird's Calendar add-on, it will automatically be updated to match the new version of Thunderbird. Refer to this Calendar troubleshooting article in case of problems. System Requirements:. Window: Windows 7, Windows Server 2008 R2 or later. Mac: Mac OS X 10.9 or later. Linux: GTK+ 3.4 or higher.

To ensure the safest email experience, we recommend upgrading to a Mac OS version that Apple supports. Visit this Apple Support Page to learn more about upgrading.

While Thunderbird will still continue to work on unsupported versions, using Thunderbird on a supported version will provide you with the best and safest user experience.

Thunderbird 45 will continue to work with Mac OS X 10.6, 10.7 and 10.8 but will not receive any further updates or security fixes. Thunderbird 45 can be downloaded from here. First pick the folder for your locale and then download the package.

What's the right way to migrate a Thunderbird profile from a Mac to Windows 10, in a way that preserves multiple email accounts and identities?

I use Thunderbird 60.6.1 on macOS 10.14. I have 9 email accounts with about 20 email identities between them. I would like to copy all these to a Thunderbird profile in a Windows 10 VM that I'm running on the same machine under VMware, so that I can access all my email accounts in Thunderbird under both OSes. How can I do this?

I have tried copying the contents of my ~/Library/Thunderbird/Profiles/<whatever>.default profile directory over to the %USERPROFILE%/AppData/Local/Thunderbird/Profiles/<whatever>.default on the Windows VM. It kind of works, in that mail appears there and I can log in to my mail server, but only 1 of my 9 email accounts shows up on the receiving end.

I have tried doing the transfer both with a .zip file of my profile that I transferred over using Dropbox and VMware shared folders, and a FAT-formatted USB drive that I first attached to the Mac side and then the Windows side. When I did the zip file, I got a couple errors when extracting it. No errors when copying the profile over using the USB drive. But same results with both procedures: only one (my primary) email account shows up on the receiving Windows side.

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Any ideas?