If your Mac is 2010+, then you may be able to upgrade to a newer version of macOS where the latest release of Thunderbird is still supported. Here is where you can get older versions of Thunderbird (this is the developer's site for official downloads), but you will need to figure out what the last version is compatible with macOS 10.11 (I know Firefox stopped supporting macOS 10.11 a couple years ago so I assume the same for Thunderbird): Only Chromium based web browsers are still supporting macOS 10.11, but I don't expect this to last much longer either. You are better off using a browser based IMAP email so you can use a standard web browser to access the email. Even if an old version of Thunderbird still works to get your messages will it even be able to display them? It probably won't work for much longer anyway. The Internet is constantly changing so old apps based on browser technology quickly become out of date. You won't be able to use the latest version since Thunderbird requires at least macOS 10.12+.Įven if you can find a version to download, it probably won't work because it uses browser technology to work.

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