Hello,
I tryed using kolab calendar with Roundcube 1.4.11, especially the bday-calendar function, working fine with local contacts. But I get an error, if choose some carddav-contacts.
Error in RC-log:
PHP Error: Addressbook source (carddav_3) not found! in /var/www/html/program/include/rcmail.php on line 262 (GET /?_task=calendar&source=__bdays__&_action=load_events&start=2021-06-21T00%3A00%3A00&end=2021-06-28T00%3A00%3A00&_=1624352198493)