Some related sharing limitations are discussed at #5050.

We don't implement https://github.com/sabre-io/dav/blob/master/lib/CalDAV/Backend/SharingSupport.php interface yet. That might be something to start with.

👍 ! Seems pretty close to the suggestion I made in #15676 (comment), regarding the issue that currently used "getUsersOwnCalendars" does not list calendars shared to the user, and that some kind of "getUserEditableCalendars" method would be of great help. 😇

Workaround: Create a team meeting in your personal calendar, check sending e-mail notifications, and then change the assignment of the event to your team calendar. Drawback: if you change the date, nobody is notified again, unless you assign the event back to a calendar you own, do the shift and assign it back to the team calendar.

As this is a bit hard to explain and understand we think that an extra method "getUserEditableCalendars" that controls the Send email checkbox would be the experience that users expect. Now you see this checkbox even if you don't have the rights to send an e-mail (and you wonder why nobody confirms the event).

We always recommend that teams should create an extra user who then owns the team's root folder, addressbook and also calendar. Those should not belong to a person, as the team would loose those assets if a founder leaves the team.

Let me add some actual kind words :)
I have been wanting to setup Nextcloud for years, and finally got the chance in our open-source-friendly startup. I am in love with the diversity it offers and customizability, everyone is ready to adopt it - were it not for unpolished corners like these, that lead them to continue with Google (even though they themselves don't want to!) until they are resolved.
I so badly want Nextcloud to succeed and build a product together with you to displace Teams, GSuite and all their crap, even Github once Gitea federation is implemented, all with a SSO through a suite like Stackspin. But before all that, we need to develop a rock-solid foundation that convinces non-techy business users, too.

@ChristophWurst "It would": I totally agree. I just fear that I might at some point just implement it in my own NC instances and leave the community behind, just for lack of time. Anyhow, of course it is a very good idea -- or better: the name of the game -- to rather try to fix things upstream than to hack around downstream.

Just now I have posted to sabre-io: sabre-io/dav#1454 and sabre-io/vobject#614

My texts there are a little bit sparse. We will see what happens.

The only workaround we found to resolve this issue at work is to use Thunderbird with client-side scheduling.
It's not perfect but we can send invitations from owned or shared calendar.

Limits of this solution :

• The server is not up to date if the user doesn't refresh event when he receives an answer
• If a user accept from the Nextcloud Mail App, the answer is never received by the organizer
• When there is multiple attendees, only the organizer knows who have accepted/refused invitation, other attendees can only see their own status
• In some case, when you accept too quickly an invitation just received, TB is not able to update the calendar
• If a user invite from the Calendar App, attendees can accept with TB interface or click on the button in the mail body resulting in different behaviour
• needs to deploy TB everywhere...

When moving from (even very old - 2010) Outlook/Exchange system, users can be disappointed to loose some functionalities.
It should be a top priority to resolve this issue in order to compete with O365 and GSuite in small/medium business context.

@Mer0me Do you see a chance to test my PR #36756?

@rotdrop Tests are very difficult in a near-production environment with 400+ users. But I follow your PR since few weeks, I will post relevant information about it if I can.

The only workaround we found to resolve this issue at work is to use Thunderbird with client-side scheduling. It's not perfect but we can send invitations from owned or shared calendar.

Limits of this solution :

* The server is not up to date if the user doesn't refresh event when he receives an answer

* If a user accept from the Nextcloud Mail App, the answer is never received by the organizer

* When there is multiple attendees, only the organizer knows who have accepted/refused invitation, other attendees can only see their own status

* In some case, when you accept too quickly an invitation just received, TB is not able to update the calendar

* If a user invite from the Calendar App, attendees can accept with TB interface or click on the button in the mail body resulting in different behaviour

* needs to deploy TB everywhere...

When moving from (even very old - 2010) Outlook/Exchange system, users can be disappointed to loose some functionalities. It should be a top priority to resolve this issue in order to compete with O365 and GSuite in small/medium business context.

This^

I am in the same position trying to get this work for a small business. If this will not be fixed within this year I can't hold on to nc anymore and am forced to move to O365 as much as I want to avoid that :(
I appreciate all of the amazing work done, but its barely not feasible in an work environment right now.

We have found the Sabre invitation plugin to skip invites if the organizer of the event is not the owner of the calendar. Right now that happens for shared calendars because \OCA\DAV\CalDAV\Calendar::getOwner overwrites \Sabre\CalDAV\Calendar::getOwner. Upstream returns the principaluri of the owner, we return the principaluri of the sharee.
We want to test if this revives the invites in shared calendars. We might need some adjustments for other places that use the getOwner method.

The method overwrite was added in owncloud/core#21964, before Sabre supported sharing