Document: If you are using CalDav with the majority of the providers you can't move one event from one calendar to another, because we are using PUT command and the CalDav server doesn't work with it if the UID already exists.

[rtanglao]

From B Shopov in #sumo:

• The issue is that bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1873834 If you are using CalDav with the majority of the providers (I am testing some more atm) you can't move one event from one calendar to another, because we are using PUT command and the CalDav server doesn't work with it if the UID already exists. There are 2 bugs on that subject and it would be nice to document it that we don't support this now and it's a known issue.

[bogomil]

I will add the comments here :)

[bogomil]

Unable to move an event from one CalDav Calendar to another.

In some of the CalDav providers, the attempt to move one event from one calendar to another that belongs to the same consumer fails with the following error seen only in the developer tools.

<?xml version="1.0" encoding="UTF-8"?>
<D:error xmlns:D="DAV:">
  <no-uid-conflict xmlns="urn:ietf:params:xml:ns:caldav" />
</D:error>

Since Thunderbird uses the PUT command to place the new event into the new calendar, the CalDav Server rejects it because the same UID already exists for the same consumer. The original event stays in the first calendar, and it's not moved to the new one. There is no workaround until the bug is addressed.

References

The problem appears on CalDav servers for mailbox.org and fastmail.com, but some other providers might also experience it.

[bogomil]

Is there anything else I need to do/provide?