We need a shared calendar within a small company (<20 persons).
When we schedule meetings (we mostly use calendar invitations sent by mail, from TB+lighning or KMail or Outlook) we want to see other's calendars to find a time acceptable for all participants.
We consider using egrouware. It has s WebDAV interface for calendar sharing, we already tested it with TB, we set up individual calendars on egroupware and synchronised with TB.
It basically works but with some problems (errors, long sync time etc.). So this is one issue to get it working smooth.
Further we'd like see other's calendars. We've found egroupware can create and provide (via webdav) a group calendar which we can view in TB. But, lightnign has a function Invite Attendees which shows a kind of shared calendar view. Seems perfect for us, but we don't have any idea how to setup this.
We can't find any documentation, we also haven't found any examples, guides on the net.
We are looking for a "success story" to know if this direction make sense.
Other solutions are also possible (except MS based, our network is purely OS).