CalDAV configuration for Thunderbird
With servermx.com you have SOGo (www.sogo.nu) which supports CalDAV and CardDAV.
CardDAV and CalDAV enable to access online contact and calendar information.
How to set up CalDAV for Thunderbird
The following configuration is the string you need to use for connecting to your calendar:
For SOGo 2
Location: https://sogo.servermx.com/SOGo/dav/{USER_MAIL_BOX}/Calendar/personal
For SOGo 5
Location: https://sogo5.servermx.com/SOGo/dav/{USER_MAIL_BOX}/Calendar/personal
where {USER_MAIL_BOX} is the email address (e.g. test@yourdomain.com).