Samsung Calendar Duplicating Outlook Events: Issue still persists on S25 Ultra

[DrZoo]

I've been experiencing an issue since the Galaxy S22 Ultra, and it persists on my brand new S25 Ultra with One UI 7/Android 15 (as well as the phones in between). I did not restore from my previous phone, but set it up as a brand new phone.

In the Samsung Calendar app, Outlook calendars are duplicated daily. However, when I check my calendar via the Outlook web version (https://outlook.live.com/calendar/), everything appears correctly - only one instance of each calendar exists.

I was hoping that with Samsung's latest and greatest, the S25 Ultra, this issue would finally be resolved, but unfortunately, it’s still happening. The duplication problem only affects Outlook calendars: Gmail calendars within the Samsung Calendar app do not have this issue. This suggests the problem is specific to Outlook integration.

I've tested multiple Outlook email accounts, and they all experience the same duplication, so it's not account-specific. Over the years, I’ve seen many posts online about this issue, yet it still hasn’t been fixed.

Does this need to be addressed by Microsoft, or is it something Samsung needs to fix?

[Helenna]

Hi DrZoo,

We appreciate you bringing this to our attention. We understand how frustrating it can be to experience calendar duplication issues, especially when setting up a new device.

Since you've noticed this problem across multiple devices, it may be related to the sync process between Samsung Calendar and Outlook. To help resolve this, please try the following steps:

Remove and Re-add Outlook Account:  Go to Settings > Accounts and Backup > Manage Accounts. Select your Outlook Account and tap Remove Account. Restart your device and re-add the account in Samsung Calendar.

Verify Samsung Calendar Sync Settings: Open Samsung Calendar. Tap Menu > Manage Calendars. Check if the same Outlook calendar appears multiple times and disable any duplicatesm

Try Syncing via Microsoft Exchange Instead:  Go to Settings > Accounts and Bmackup > Manage Accounts > Add Account. Select Exchange instead of Outlook and enter your Outlook email credentials

Clear Samsung Calendar Data & Resync: Navigate to Settings > Apps > Samsung Calendar. Tap Storage > Clear Data & Clear Cache. Restart your phone and allow time for a full resync

If the issue persists, we recommend also checking if the Outlook app itself syncs correctly or trying an alternative calendar app such as Google Calendar.

Your feedback is valuable, and we will bring this to our team for further review.

Thank you.

[Lundon]

Hi Helena,

I should mention that I posted about this issue here a year ago without any response from Samsung or mods. There are also almost 3500 views on that post which tells me many customers are suffering from this same issue. You can see my original post here: https://r1.community.samsung.com/t5/galaxy-s/calendar-apps-duplicating-multiple-calendars-on-phone-o... 

I also posted about it on Reddit which has over 7700 views and lots of discussion: https://www.reddit.com/r/samsung/comments/191yiyk/android_14_update_duplicated_all_my_calendars/ 

I should mention that switching devices did not resolve the issue. The issue also exists on my Galaxy Tab A9+. I also want to mention that I've have previously tried all the troubleshooting steps listed above and none have fixed the problem. This issue is specifically tied ONLY to Microsoft email accounts. And oddly, these duplicate calendars do not exist at all when logging into your Microsoft Account directly on a PC. The duplicates only exist on our Samsung devices.

Lastly, I've also spoken with Samsung technical support. They tried to resolve this issue using remote assistance but failed to resolve it as well. I truly hope this "problem" gets some attention as it's obviously a problem affecting many, many customers. In fact, many may be completely unaware of it without checking in the calendar app.

[WebNet-WebNet]

It does it for both Outlook and Exchange on my S20, S22, S25. 

[AVonSmsng]

The list of "solutions" you suggested does nothing but confirm that the reason why Samsung's calendar sync app duplicates calendars is unknown. 
What you propose is, basically, to delete the credentials and try to reset the sync again, and again, and again, which is exactly what we all did when we set up the account the first time.
This is like saying "I understand that the phone you bought from us does not call the numbers you dial: I suggest you switch it off, then on, and try again. Or, you can reset it to factory defoults, reset your credentials as you did already, and maybe it will work".

The only fact we know is that you don't know why it happens.

[Al3azim]

I have been having this problem as well for some time now.  I have done the steps mentioned above and this continues to  happen. This seems to be more Samsung Calendar app related more than anything else.  Hopefully Samsung will actually do something about it this time.

[Tralam]

I've also had this issue for some time now. Currently now on a S23+. The duplicate calendars occur on my Outlook and Exchange accounts. I've tried removing and reconnecting the accounts. I also disabled Samsung Calendar and installed Google Calendar, and it still happens, so I don't think it's an app specific issue.

[Sierrafoxtrot]

S22 - I have the same problem but it is creating multiple calendars in the EAS (Exchange) calendar app. 

[RainbowPig738]

soooooooo I submitted this issue as an error report via the Samsung Members app a while ago (because it was driving me insane too).

They responded a few times asking me to to provide different system log files, and today they've sent me a message saying that a fix has been  implemented, and it'll be rolled out in the next Samsung Email app update!!

 

[Members_8jED6YR]

I'm still seeing the problem in Saumsung Email version 6.2.06.0 which was released 11 Dec 2025