mailcow-dockerized-docs/docs/autodiscover_config.md

This disables ActiveSync in the autodiscover service for Outlook and configures it with IMAP and SMTP instead:

Open data/web/autodiscover.php and set 'useEASforOutlook' => 'yes' to 'useEASforOutlook' => 'no'.

To always use IMAP and SMTP instead of EAS, set 'autodiscoverType' => 'imap'.