"Microsoft Outlook Sorry, we're having trouble opening this item. This could be temporary, but if you see it again you might want to restart Outlook. an unknown error has occured." Calendar Invite Disappeared

MD53 1 Reputation point

I just sent a recurring invite to my office, but I needed to edit one date. When opening the occurrence, the error message above appeared. The invite then disappeared from my calendar, but everyone else in the office still has it on their end. Where did my calendar invite go? I restarted the app and laptop to no avail. Thanks in advance!

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Faery Fu-MSFT 17,811 Reputation points Microsoft Vendor

    Hi @MD53 ,

    Welcome to our forum!

    What's the version of your Outlook? (File > Office Account > About Outlook). Please make sure you have upgraded your Outlook to the latest version.

    In order to further confirm if your issue is related to your client or mailbox, please log in to your web mail to check if the issue could be reproduced there.

    If the issue occurred on Outlook only, can you find it after searching for subject or other details?

    Try to clean view settings: Open Run by pressing Windows + R keys at the same time.
    Enter the following command in Run and press Enter to reset Outlook’s viewing pane settings: outlook.exe /cleanviews

    Besides, corrupted Outlook profile can also lead this issue, so please try creating and using a new Outlook profile via Control Panel > Mail > Show profile > Add and see if there is any difference.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
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