As of last month, Thunderbird — which has been operated by Mozilla subsidiary MZLA Technologies since 2020 — is finally done with its notable transition from version 115 to version 128. September 5 gave us Thunderbird 115.15.0, which was the last release of version 115 (“Supernova”) and also the last version to still run on Windows 7, Windows 8, macOS 10.12, macOS 10.13, and macOS 10.14. But if you thought things were going to be simple again, you were wrong. Going forward, Thunderbird will have four release channels on its download page, similar to what we see with Firefox. Thunderbird’s four…