[GH-ISSUE #390] All data lost after first sync in Outlook #1275

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opened 2026-03-14 00:50:10 +03:00 by kerem · 3 comments

kerem commented

2026-03-14 00:50:10 +03:00

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Originally created by @ThaliaFP on GitHub (Apr 21, 2023).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/390

I added the sync profile, two way sync chosen.
At first, it showed all entries, then deleted them from the server. Now all my data is gone. How do I restore it?

Win 11 22H2
Caldavsync Version 4.4.1.0
mailbox.org Server: Version der Benutzeroberfläche: 7.10.6 Rev27
Server-Version: 7.10.6-Rev41
Outlook Pro Plus 2019 Version 16.0.16227.20280

report210423.txt
SynchronizationReports.zip

Originally created by @ThaliaFP on GitHub (Apr 21, 2023). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/390 I added the sync profile, two way sync chosen. At first, it showed all entries, then deleted them from the server. Now all my data is gone. How do I restore it? Win 11 22H2 Caldavsync Version 4.4.1.0 mailbox.org Server: Version der Benutzeroberfläche: 7.10.6 Rev27 Server-Version: 7.10.6-Rev41 Outlook Pro Plus 2019 Version 16.0.16227.20280 [report210423.txt](https://github.com/aluxnimm/outlookcaldavsynchronizer/files/11294465/report210423.txt) [SynchronizationReports.zip](https://github.com/aluxnimm/outlookcaldavsynchronizer/files/11294466/SynchronizationReports.zip)

kerem commented

2026-03-14 00:50:16 +03:00

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@dXrayb commented on GitHub (Apr 26, 2023):

I've met this problem too, now I use EVO to sync my calendar.

@dXrayb commented on GitHub (Apr 26, 2023): I've met this problem too, now I use EVO to sync my calendar.

kerem commented

2026-03-14 00:50:21 +03:00

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@aluxnimm commented on GitHub (May 2, 2023):

It looks like you have the wrong resource url or some issues with the access rights/filesystem on the server maybe, because every put request fails with
CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '404' ('Not Found'). Message:
There is nothing here, sorry.

So the server returns a 404 not found immediatly after trying to upload an event.

What does test or discover settings report in the sync profile?

Data should never be gone permantly, because we never delete anything in Outloop permanently but move calendar entries only into the deleted item folder, and you can restore them from there.

@aluxnimm commented on GitHub (May 2, 2023): It looks like you have the wrong resource url or some issues with the access rights/filesystem on the server maybe, because every put request fails with <ExceptionThatLeadToAbortion>CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '404' ('Not Found'). Message: There is nothing here, sorry. So the server returns a 404 not found immediatly after trying to upload an event. What does test or discover settings report in the sync profile? Data should never be gone permantly, because we never delete anything in Outloop permanently but move calendar entries only into the deleted item folder, and you can restore them from there.

kerem commented

2026-03-14 00:50:26 +03:00

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@dXrayb commented on GitHub (May 4, 2023):

It looks like you have the wrong resource url or some issues with the access rights/filesystem on the server maybe, because every put request fails with CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '404' ('Not Found'). Message: There is nothing here, sorry.

So the server returns a 404 not found immediatly after trying to upload an event.

What does test or discover settings report in the sync profile?

Data should never be gone permantly, because we never delete anything in Outloop permanently but move calendar entries only into the deleted item folder, and you can restore them from there.

But when you restore them, CalDavSynchronizer will remove them again.

@dXrayb commented on GitHub (May 4, 2023): > It looks like you have the wrong resource url or some issues with the access rights/filesystem on the server maybe, because every put request fails with CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '404' ('Not Found'). Message: There is nothing here, sorry. > > So the server returns a 404 not found immediatly after trying to upload an event. > > What does test or discover settings report in the sync profile? > > Data should never be gone permantly, because we never delete anything in Outloop permanently but move calendar entries only into the deleted item folder, and you can restore them from there. But when you restore them, CalDavSynchronizer will remove them again.