Mail:

The default theme for Roundcube was changed to the nicer Larry theme.
Exchange/ActiveSync support has been replaced with z-push 2.3.6 from z-push.org (rather than z-push-contrib).

ownCloud (now Nextcloud):

ownCloud is replaced with Nextcloud 10.0.5.
Fixed an error in Owncloud/Nextcloud setup not updating domain when changing hostname.

Control Panel/Management:

Fix an error in the control panel showing rsync backup status.
Fix an error in the control panel related to IPv6 addresses.
TLS certificates for internationalized domain names can now be provisioned from Let's Encrypt automatically.
Third-party assets used in the control panel (jQuery/Bootstrap) are now downloaded during setup and served from the box rather than from a CDN.

DNS:

Add support for custom CAA records.

MIAM.