I keep getting scam/ spam calendar entries

If you are facing the problem outlined in this post

https://learn.microsoft.com/en-us/answers/questions/5597205/prevent-pfishing-calendar-items

Microsoft is aware of the problem but there is currently no fix. There are no Rules you can create or settings you can change in the Outlook client that will stop these SPAM Calendar Events.

You can vote for and comment on this Feature Request:
https://feedbackportal.microsoft.com/feedback/idea/29cad13e-0948-f011-a2da-7c1e529ed9e2
(You must "Sign In" at the top right before you can vote).

If your organization has a Microsoft Defender for Office 365 subscription, there are steps you can take to mitigate the impact:

https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-calendar-security-through-enhanced-remediation/4456876

If you are in an IT Managed environment there are Mail Flow Rules that your IT Admin can implement that will block all external Calendar invites (and allow for specific exceptions):

https://learn.microsoft.com/en-us/answers/questions/5558001/how-to-prevent-calendar-invites-from-external-sour

Just had 15 minutes of my anti-virus scrubbing events that contained trojans, all because I used the browser version of outlook to cleanout a shared mailbox. Think it only stopped because I found the event emails and deleted them, it was almost like they kept recreating the events after they were removed. Can't find the option to turn it off anymore.

In the classic outlook it can still be turned off under Mail > Tracking > Uncheck "Automatically process meeting requests...".

Edit: Also go here: Options > Calendar > Automatic accept or decline (button near the bottom) > Uncheck "Automatically accept meeting requests and removing canceled meetings" (Only in the Classic Outlook desktop app, not the new outlook)

Hi,

Thank you for sharing your question. I understand how annoying and worrying it is to keep receiving scam or spam calendar entries, especially when they continue to appear even after you delete or block them. It’s completely reasonable to feel frustrated because these fake events often look urgent, such as “Payment Failed” notifications, and they can make your calendar feel unsafe. According to Microsoft community guidance, these entries typically appear when scammers send calendar invitations or event‑based phishing messages that are automatically added to your Outlook calendar, even if the email itself is junk. Many of these spam events rely on Outlook’s default behavior of automatically adding events from email or automatically processing calendar invitations, which allows them to keep reappearing. Security organizations also warn that these entries often contain phishing links and should never be clicked.

The best way to stop these events permanently is to turn off Outlook’s automatic calendar processing so that meeting requests and events from email are not added to your calendar without your approval. This can be done in Outlook settings by disabling the “Automatically process meeting requests” or “Automatically add events from email” options, which prevents spam invites from appearing at all. You can also report these events as junk or phishing within Outlook, which helps Microsoft strengthen its filtering and blocks future events from those senders.

To help you further, may I ask whether the spam entries appear only in Outlook on the web, in the desktop app, or across all your devices? Please follow up so I can guide you step‑by‑step based on the version of Outlook you’re using and help you stop these entries for good.

I hope this helps.

Best Regards,

Noel

To stop receiving scam or spam calendar entries in Outlook, you can take the following steps:

1. Delete and Block: Continue to delete these entries and block the senders if they are associated with specific email addresses.
2. Check Calendar Permissions: Ensure that your calendar is not shared with anyone who might be adding these entries. You can adjust sharing settings in Outlook to limit who can see or edit your calendar.
3. Use Rules: Set up rules in Outlook to automatically delete or move calendar invitations that match certain criteria (like specific keywords in the subject line).
4. Report Spam: If you receive these entries via email, report them as spam. This can help improve the spam filtering in Outlook.
5. Review Account Security: Make sure your account is secure. Change your password and enable multi-factor authentication to prevent unauthorized access.
6. Check for Add-ins: Sometimes, malicious add-ins can cause unwanted behavior. Review and remove any add-ins that you do not recognize or need.
7. Contact Support: If the problem persists, consider reaching out to Microsoft Support for further assistance.

By following these steps, you should be able to reduce or eliminate the spam calendar entries you are encountering.