Sync between shared calenders failed since two weeks

Joachim Eichner 0 Zuverlässigkeitspunkte
2026-09-14T11:45:26.5066667+00:00

Dear Sir or Madam, Since the Office 365 outage two weeks ago, our shared calendars have stopped working—even though permissions have been granted and the Outlook app has been reset and reinstalled.

E.g.: J.shares a calendar with S.. The permissions are in place—just as they have been all along. Previously, whenever an entry was changed or created, it would appear immediately in the calendar because it synced right away. For the past two weeks, however, this has not been working. Additionally, the email that is supposed to be generated when an entry is made is no longer being sent. We urgently need this calendar, as we use it to manage our household. We are Premium customers, so it would be greatly appreciated if you could restore these features for us as soon as possible. The Outlook app support representative indicated that the issue lies on your end and that once it’s properly configured on your end, the Outlook app will sync correctly again.

I had to times contact with Microsoft. But everytime a got no answer.

Thank you very much,

J.

Outlook | Web | Outlook.com | Kalender
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  1. Chloe-V 13,460 Zuverlässigkeitspunkte Externe Microsoft-Mitarbeiter Moderator
    2026-09-15T02:22:16.0866667+00:00

    Disclaimer: I noticed that your locale setting is de-DE, but your request was submitted in English. To ensure consistency and clarity, I will continue to respond in English.

    Hi @Joachim Eichner

    I’m sorry you have had to contact support repeatedly without receiving a clear resolution, especially when this shared calendar is important for managing your household.

    Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.

    Please sign in to Outlook.com in a browser with both accounts and test whether a newly created calendar entry appears there. If synchronization also fails on the web, the issue is likely related to the calendar-sharing connection rather than the Outlook app.

    The calendar owner can then:

    • Remove the other person’s calendar permission.
    • Share the calendar again with Can edit permission.
    • Ask the recipient to accept the new sharing invitation.
    • In Outlook.com, open Settings > Calendar > Shared calendars and enable the calendar under Calendar updates to receive email notifications about changes. Microsoft confirms that these notifications must be selected for each shared calendar. Receive notifications from a shared calendar

    If the calendar still does not synchronize on Outlook.com after being shared again, please contact Microsoft Support and provide both account addresses privately, the approximate date the issue began, and the results of the browser test.

    Please feel free to let me know if you have any further updates, thanks.

    If the answer is helpful, please click "Yes". If you have extra questions about this answer, please click "Comment".   
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