[GH-ISSUE #368] Caldavsynchronizer changes events without user interaction #1254

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opened 2026-03-14 00:46:46 +03:00 by kerem · 0 comments

kerem commented

2026-03-14 00:46:46 +03:00

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Originally created by @fvb-sb on GitHub (Oct 7, 2022).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/368

Hi there.

We're using a shared calendar on our Nextcloud instance with a couple of clients connecting through MS Outlook + CalDavSynchronizer. Using the default settings (2-way sync) of the recommended Outlook Addin CalDavSynchronizer leads to a lot of entries in Nextcloud's activity stream without user interaction.

Find attached a zipped file containing three exports of an event which have been created for demonstration purposes. The first export (22C0A467-506E-48AC-932F-5A67C2021CD7.ics) was made after creating the event through Nextcloud WebUI without any CalDavSync interaction. The second one (22C0A467-506E-48AC-932F-5A67C2021CD7(2).ics) was made after a colleague has changed the location of the event and synchronized through CaldavSyncronizer. The third one (22C0A467-506E-48AC-932F-5A67C2021CD7(3).ics) was made after CaldavSynchronizer synchronized the event to another colleagues Outlook Calendar.

Nextcloud support did some research on this:

So Caldavsynchronizer must rewrite the event at synchronization and send back the changes to the Nextcloud server. For example, the timezone ID is initially set to "Europe/Berlin", caldavsynchronizer rewrites it to "W. Europe Standard Time".

But today they wrote me that they can't figure out why Caldavsynchronizer changes events without user interaction and asked me to raise an issue here.

So the problem is that Nextclouds activity stream is flooded with notifications about changed events even when no one has changed anything on the events. This leads to confusion.

Thanks in advance for taking a look into it!
Sebastian
nextcloud-event-exports.zip

Originally created by @fvb-sb on GitHub (Oct 7, 2022). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/368 Hi there. We're using a shared calendar on our Nextcloud instance with a couple of clients connecting through MS Outlook + CalDavSynchronizer. Using the default settings (2-way sync) of the recommended Outlook Addin CalDavSynchronizer leads to a lot of entries in Nextcloud's activity stream without user interaction. Find attached a zipped file containing three exports of an event which have been created for demonstration purposes. The first export (22C0A467-506E-48AC-932F-5A67C2021CD7.ics) was made after creating the event through Nextcloud WebUI without any CalDavSync interaction. The second one (22C0A467-506E-48AC-932F-5A67C2021CD7(2).ics) was made after a colleague has changed the location of the event and synchronized through CaldavSyncronizer. The third one (22C0A467-506E-48AC-932F-5A67C2021CD7(3).ics) was made after CaldavSynchronizer synchronized the event to another colleagues Outlook Calendar. Nextcloud support did some research on this: <quote> So Caldavsynchronizer must rewrite the event at synchronization and send back the changes to the Nextcloud server. For example, the timezone ID is initially set to "Europe/Berlin", caldavsynchronizer rewrites it to "W. Europe Standard Time". </quote> But today they wrote me that they can't figure out why Caldavsynchronizer changes events without user interaction and asked me to raise an issue here. So the problem is that Nextclouds activity stream is flooded with notifications about changed events even when no one has changed anything on the events. This leads to confusion. Thanks in advance for taking a look into it! Sebastian [nextcloud-event-exports.zip](https://github.com/aluxnimm/outlookcaldavsynchronizer/files/9733589/nextcloud-event-exports.zip)