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[GH-ISSUE #292] Outlook CalDav Synchronizer: error synch recurring task with Open Xchange server #1186

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opened 2026-03-14 00:34:29 +03:00 by kerem · 5 comments

kerem commented

2026-03-14 00:34:29 +03:00

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Originally created by @daphne777 on GitHub (Oct 23, 2020).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/292

Hello,
following problem:
Caldav Synchronizer does not sync recurring task with Open-Xchange server.
Normal tasks (not recurring) are working fine.

Error report and LogFile in the attachment.

Data:
Windows10 (1909)
Outlook 2010 (also testet with 2016)
CalDavSynchronizer Version: 3.8.2.0
CalDav/Cardav Server und Version: UCS Server 4.4 / OX Version 7.10.4-ucs1
ErrorReport.txt
LogFile.txt

Originally created by @daphne777 on GitHub (Oct 23, 2020). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/292 Hello, following problem: Caldav Synchronizer does not sync recurring task with Open-Xchange server. Normal tasks (not recurring) are working fine. Error report and LogFile in the attachment. Data: Windows10 (1909) Outlook 2010 (also testet with 2016) CalDavSynchronizer Version: 3.8.2.0 CalDav/Cardav Server und Version: UCS Server 4.4 / OX Version 7.10.4-ucs1 [ErrorReport.txt](https://github.com/aluxnimm/outlookcaldavsynchronizer/files/5428535/ErrorReport.txt) [LogFile.txt](https://github.com/aluxnimm/outlookcaldavsynchronizer/files/5428537/LogFile.txt)

kerem closed this issue

2026-03-14 00:34:34 +03:00

kerem commented

2026-03-14 00:34:40 +03:00

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@aluxnimm commented on GitHub (Oct 23, 2020):

Need to investigate if and how OX supports recurring tasks

@aluxnimm commented on GitHub (Oct 23, 2020): Need to investigate if and how OX supports recurring tasks

kerem commented

2026-03-14 00:34:45 +03:00

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@daphne777 commented on GitHub (Oct 23, 2020):

Hello Aluxnimm,

thanks for the fast reply.

I think OX supports recurring tasks.
On the web interface of Open-Xchange I can create recurring tasks,
but they are not synchronized with Outlook.

If you need more information just ask.

@daphne777 commented on GitHub (Oct 23, 2020): Hello Aluxnimm, thanks for the fast reply. I think OX supports recurring tasks. On the web interface of Open-Xchange I can create recurring tasks, but they are not synchronized with Outlook. If you need more information just ask.

kerem commented

2026-03-14 00:34:50 +03:00

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@aluxnimm commented on GitHub (Oct 23, 2020):

Just tested this, it seems recurring tasks are not exposed via the CalDAV API. if I create such a task in OX it's not available in the collection, if I change the same task back to non recurring it gets synced. When trying to sync tasks with RRULE to the server, OX responds with 400 Bad Request. So I guess, they are not supported via CalDAV. I will ask the OX developers if this is by design.

@aluxnimm commented on GitHub (Oct 23, 2020): Just tested this, it seems recurring tasks are not exposed via the CalDAV API. if I create such a task in OX it's not available in the collection, if I change the same task back to non recurring it gets synced. When trying to sync tasks with RRULE to the server, OX responds with 400 Bad Request. So I guess, they are not supported via CalDAV. I will ask the OX developers if this is by design.

kerem commented

2026-03-14 00:34:55 +03:00

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@daphne777 commented on GitHub (Oct 27, 2020):

Hi Aluxnimm,
any answer from OX yet?

I hope it is a bug (not by design) and they will solve it with a update? :-)

@daphne777 commented on GitHub (Oct 27, 2020): Hi Aluxnimm, any answer from OX yet? I hope it is a bug (not by design) and they will solve it with a update? :-)

kerem commented

2026-03-14 00:35:00 +03:00

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@aluxnimm commented on GitHub (Nov 3, 2020):

According to OX recurring tasks are not supported via CalDAV, since OX uses a different internal data model. So nothing we can do on our side atm.
I suggest turning off syncing of recurring tasks from Outlook in the advanced settings/task mapping configuration to avoid the error.

As a workaround you can create individual tasks or use recurring events in a seperate calendar collection used for tasks.

@aluxnimm commented on GitHub (Nov 3, 2020): According to OX recurring tasks are not supported via CalDAV, since OX uses a different internal data model. So nothing we can do on our side atm. I suggest turning off syncing of recurring tasks from Outlook in the advanced settings/task mapping configuration to avoid the error. As a workaround you can create individual tasks or use recurring events in a seperate calendar collection used for tasks.