Can't delete calendar item

Question

Hi,

I have one calendar event that I can't delete.

What I have tried:

• Delete through Outlook, get error ''the client operation failed''
• Delete through OWA --> can delete, but when refresh the page it comes back.
• Delete using the search-mailbox powershell command (search-mailbox -identity <mailbox> -searchquery 'Subject:"Subject"' -Deletecontent)
• Delete using the remove calendarevent powershell command (remove-calendarevents -identity <mailbox> -cancelorganizedmeetings -querystartdate "5/26/2021" -querywindowindays 1)

I can't open the calendar event, get the following error --> there is currently a problem opening item. this may be temporary, but if it happens again, you may need to restart outlook. the client operation failed

The irritating part is that always a calender event reminder pops up in outlook.

Can someone help me assist in this?
thanks in advance.

Answer 1

I have looked a little deeper into it and it looks like the meeting was created from a shared mailbox, and the users where invited.
However, when looking at the event in the shared mailbox, I see that it is an appointment with no members.

I used the following command to get more info about the calendar event: get-calendardiagnosticobjects -identity <mailbox> -subject "<subject>"

Below is the information about the calendar event of a particular user:

Here is the information from the same calendar event now from the shared mailbox

After doing this, I noticed that the event is deleted from the shared mailbox. I don't know if a user did this on coincidence. --> turns out the user deleted the event on the shared mailbox.

Answer 2

Hi @Anonymous

My own mailbox is not OK after deleting the event from shared mailbox.
The event is still visible in my and the users mailbox, and can't be deleted.

So yeah, the issue still exists.

Answer 3

Hi @j586 ,

Thanks for sharing those information.
I did a research about the error messages but unfortunately the document has been deleted:
2714118 Calendar items that are copied are missing in Exchange Server 2007

I tried to reproduce the issue but no luck, so I may give you some suggestions based on my knowledge.

1. As you said, you deleted this event from your shared mailbox. Could it be canceled by the host?
2. Are there any users using the third-party mail clients with your shared mailbox? Such as gmail or hotmail?
3. And could you see this event in your shared mailbox using MFCMAPI?

Hope that could work for us.

Best regards,
Lou
Do the suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark the helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.

If you are still stuck in this issue, please feel free to post your questions.

Regards,
Lou

---

If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 4

Hi @Anonymous ,

See the answers to your questions below:

1. As you said, you deleted this event from your shared mailbox. Could it be canceled by the host?
   • the event was created on the shared mailbox, and there it is deleted, I can't cancel the event, because I see the event only on the particular user where I can't even open the event.
2. Are there any users using the third-party mail clients with your shared mailbox? Such as gmail or hotmail?
   • I don't know exactly, but it is certainly possible they have connected the shared mailbox on other devices such as mobile.
3. And could you see this event in your shared mailbox using MFCMAPI?
   • Using MFCMAPI I can't see the calendar event, thats probably because the event was already deleted from the shared mailbox.

Is there a way to delete this particular calendar event from exchange, even bij powershell or some other script?

Thanks for all your help so far

Kind regards

Answer 5

Hi @Michel Moes ,

The mailbox that has this particular calendar event has been ended, that's why I didn't investigate the issue any further.
But I want to add the following comment, so you and mayby others, don't have to struggle this much as I did so far.

I don't know how, but for some reason I managed to get this particular calendar event in my test mailbox.
The only way I ended up doing, to get rid of this event, is the following: (Credits to @Anonymous )

1. Export mailbox to PST
2. Remove mailbox
3. Create new mailbox
4. import PST

This is the only method that seemed to work for my test mailbox.