After migrating users can’t log in via Outlook (new)

Batool

Hi everyone,
After migrating 55 mailboxes from a Plesk server to a Mailcow server, I’m facing an issue where migrated users are unable to log in via the new Outlook client. it is working smoothly with classic outlook and Thunderbird
The SSL certificate by Let’s Encrypt and appears to be working correctly.
I enabled by “ force_renew ”
Has anyone encountered a similar issue or can suggest what might be causing this?

Note that my mailcow version 2021

esackbauer

Try to configure outlook via IMAP/SMTP.
Be aware that “new” Outlook will store your credentials with Microsoft and they will have every mail routed via their servers. “new” outlook is basically just a Webpage in an app, using a cloud service.
We do not support such old mailcow versions.

Ganzjahresgriller

@Batool You’re very brave to be running such an old mail server, and with New Outlook on top of that. Data protection seems to be completely irrelevant to you.