A bit late, sorry. On Tue, Jun 2, 2020, at 04:55, Ken O'Driscoll via mailop wrote: > On Thu, 2020-05-28 at 13:35 -0600, Daniele Nicolodi via mailop wrote: >> Does anyone know if there is any alternative to Outlook to access >> >> Exchange Online mailboxes that require modern authentication? > > Take a look at Davmail, it's basically a proxy that sits in-between your > existing "legacy" MUA and O365. It handles all of the MFA and talks EWA then > presents standards based IMAP, SMTP, CalDAV and CardDAV protocol interfaces > for your MTA to use. > > I don't know if it will work for your specific environment but it works for > most people that what to continue to use Thunderbird etc. with Exchange. >
Thunderbird beta (78.0b2) supports M365’s OAuth2 support natively, no external shim required. The setup is a little weird, you need to set up the account, go to the advanced settings (so that it creates the account despite not working), switch the authentication to OAuth2 for both IMAP and SMTP, it just works.
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