Self-Hosted Calendar and Addressbook services on OpenBSD
Once you have self-hosted email up and running, you may want to add the Calendar and Addressbook features to your service bag. Nowadays, the standard protocols regarding those subjects are CalDAV and CardDAV. I decided to go with Baikal , the dedicated CalDAV+CardDAV server based on the sabre/dav framework ; the same framework used in Nextcloud DAV services AFAIK. It relies on PHP and is available as a package on OpenBSD.
Back to the sea ; the Open Source Groupware (SOGo), episode XI
Quoting SOGo: Open Source Groupware homepage: SOGo is groupware server with a focus on scalability and open standards. SOGo provides a rich AJAX-based Web interface and supports multiple native clients. It is a set of access tools to your Mail, Calendar and Address book. It provides Webmail, a CalDAV and a CardDAV services. It also enables integration with native clients, like Mozilla Thunderbird, Microsoft Outlook and Apple Mail. The difference with M$ Exchange is that it is Open Source software. The difference with Zafara or Zimbra is that it doesn’t come with its own backend ; it sits on top of some already running SMTP and IMAP servers.