All appointments lost on outlook.com calendar since start of september

Question

All appointments lost on outlook.com calendar since start of september

SvenKndler-3111 0

Hello there!

All the appointments in my calendar on outlook.com suddenly disappeared some days ago.

The calendar is visible. The appointments are no longer there, neither on my phone nor in the web interface.

It must be a server-side issue.

I suspect it's related to EX1464935 / MO1465074.

I contacted support but after checking all the possible user side causes they said they could not do anything about it, although I'm on a payed M365 plan.
The appointments have not been deleted on my side and it is not a filter or the likes.
They just vanished overnight and the calendar is empty.

Hu Fin 0 Reputation points

2026-09-08T22:14:50.99+00:00

I have the same problem. Except for some recurring items, all of my calendar appointments prior to March 2026 have disappeared from my Outlook365 calendar site. Help!!!

1 answer

Your answer

Hu Fin 0 Reputation points

2026-09-08T22:14:50.99+00:00

I have the same problem. Except for some recurring items, all of my calendar appointments prior to March 2026 have disappeared from my Outlook365 calendar site. Help!!!

Answer 1

Hi SvenKndler-3111,

I'm sorry to hear that you've lost all of your calendar appointments. I can certainly understand how frustrating and concerning that must be, especially when important scheduled events disappear unexpectedly.

As this is a community forum, our ability to investigate account-specific or backend service issues is very limited. Community members and moderators do not have access to Outlook.com servers, mailbox data, or recovery tools beyond the troubleshooting steps already available to users.

If you've already worked with Microsoft Support and they were unable to identify a solution or restore the missing appointments, then unfortunately there is nothing further that we in the community can do from our side. Based on your description, this appears to be beyond the scope of community support.

If the issue is related to a temporary server-side problem, synchronization issue, or an ongoing service incident, it may be worth checking again over the next day or two to see whether the calendar data reappears automatically.

I'm sorry that we can't offer a more direct resolution in this case. Thank you for your understanding, and I hope the appointments are restored once the underlying issue is resolved.