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Hi,
The error I am encountering in Outlook is: "One or more items in the folder you synchronized do not match. To resolve conflicts, open the items and try this operation again." I've followed some steps but the issue persists. Can you please help.
did an O365 repair, created new profile removed OST,
cleared offline data...
Hi TechUST,
Open Outlook
Find the Conflicting Items: Look for the items causing conflicts. Look for the “Sync Issues” folder, which contains information about synchronization issues.
These could be emails, calendar events, or other data.
Retry sync again
How do I know, which items causing conflict data. Can you share steps with me
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(64, 16%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJH%3C/text%3E%3C/svg%3E)
Hi @ TechUST
Welcome to our forum!
According to my research: This issue happens when there is a local conflict of the calendar item in Outlook Desktop. The server copy of the calendar item does not have a conflict. I am afraid it is a known issue, and the Outlook Team is investigating this issue.
In the meantime, there are some workarounds you may refer to, considering you have tried ‘cleared offline data...’, it is recommended that you please try workaround 2. More information: Outlook shows conflict errors when updating or cancelling meetings - Microsoft Support
If there is any update, I will post here.
Hope it helps!
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I have already cleared offline data from calendar but still issue persisting
I m waiting for your outlook team, if they can find any other fixes.
I have already done - did an O365 repair, created new profile removed OST, and sync. So i think workaround -2 didn't work
Hi @ TechUST
Welcome to our forum!
Apologize for the inconvenience, the workaround 2 is more related to New Outlook and Outlook Web Access (OWA), if you do not want to switch to New Outlook or use Outlook Web Access (OWA), please be patient to wait for updates from the professional team, if there is any update, I will post here as soon as possible.
Thanks for your understanding!
Thank you, I'll be waiting
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(96, 76%, 19%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
Hello @Joan Hua-MSFT - Any updates on this yet. Many users in our org are now getting this duplicate calendar item issue. I can reproduce the issue by creating a new Teams meeting invite and when I open the message on my side after sending the invite there are multiple .msg files being created on the invite.
Hi @TechUST
Sorry for the late update, however, i am glad to inform you that this issue was fixed on July 18th. More information: Outlook shows conflict errors when updating or cancelling meetings - Microsoft Support
Thanks for you patience.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(140.8, 83%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ER%3C/text%3E%3C/svg%3E)
I have the same issues. Fortunately, it has not significantly impacted the users' calendars. But there are a lot of sync issues messages filling up the sync folder.
I hope they fix it soon. I still have an outstanding issue with Classic Outlook Desktop, with the regeneration tasks function, and I am still waiting after 3 years for that fix.