"On the day it was announced, it was not yet available, but downloads (and upgrades for existing users) followed some days later. As usual with the new release cadence that MZLA has been following since April, the monthly releases are relatively modest, with lots of bug fixes - the release notes list 25 bugs fixed, plus a further 16 security fixes - and only one or two major features each time."
"At this point, the Microsoft enthusiasts out there are probably shouting at their computers that EWS is deprecated and it's on its way out. Well, yes, it is, and has been since 2018. The Register mentioned it back in 2020 ... but as ever, the real story is a little more complicated than that. Yes, EWS is deprecated, and Microsoft is currently saying that it will be turned off from October 1 2026 - but this only applies to the hosted Exchange Online service."
Thunderbird 145 arrived alongside Firefox 145 and omits Firefox's integrated AI features. Downloads and upgrades became available days after announcement. The release follows MZLA's monthly cadence with mostly modest updates, including 25 bug fixes and 16 security fixes. The major new capability is native Microsoft Exchange support via Exchange Web Services (EWS). EWS is officially deprecated for Microsoft 365 and Exchange Online with retirement slated for October 1, 2026, but remains supported in on-premises Exchange Server deployments. Native EWS support enables Thunderbird to connect directly to existing on-premises Exchange servers.
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