Hi,

I have a customer recently migrated from Rackspace email to Office 365. Just this one user has some calendar issues.

She has a ton of recurring calendar items been migrated over.

1. Initially, connecting Outlook 2013 to O365, read calendar items fine
2. After a few days (Not sure what trigged this), the user cannot access single item of the recurring event, it gives error "cannot open, this might be temporary. You changed one of the recurrence of this item, and this instance no longer exists..."
3. for the same item, go to OWA to access, it's fine!

Can't figure out what's the issue. if it's corrupted item, why the server end/OWA is ok? If this is ok, why outlook sync was originally ok?

I think this is outlook issue rather than office 365?

Thanks for any suggestions!

John

Hi John,

Since it works correctly in OWA, there might be some corruption in OST file. We can try recreate the OST file and then test the issue again. To do this, exit Outlook, navigate to the .ost file and then rename it to .old. Then, restart Outlook to sync a new one from the server. By default, the OST file is stored in the following folder path:

C:\Users\%username%\AppData\Local\Microsoft\Outlook

Please let me know the result.

Regards,

Steve Fan

Forum Support