Receiving Calendar Invites for Other Accounts

Question

Hello,

We use the classic version of Outlook at my office.

One year ago, we had a staff member leave and my IT set up email forwarding from that account to my account, so I could stay on top of any emails, etc.

They also "attached" that account to mine and I had their calendar under "My Calendars."

Subsequently, I began receiving random calendar alerts from 2 other employees, neither of which are delegates or do I have any share permissions set up with their calendars.

In the last week, the original employees account was disabled, the email forwarding was removed, and we were able to remove their mailbox and calendar.

However, I am still receiving some alerts from the other 2 employees, some of these alerts are for calendar events that are no longer on their calendar.

My IT cannot come up with a solution, do you have any suggestions for me or that I can forward to them?

Answer 1

It's likely that the account of your ex colleague has some form of forwarding configured, which will remain active until the mailbox has been removed (disabling it changes nothing in this regard). There are multiple forms of forwarding that your IT folks need to check for. Those include:

• mailbox-level controls configurable via the admin center or PowerShell (ForwardingSmtpAddress or ForwardingAddress properties)
• mailbox rules, aka Outlook rules
• transport rules
• (calendar) delegate settings

I have a detailed blog article that goes over them here: https://michev.info/blog/post/4466/report-on-microsoft-365-mailbox-forwarding-all-methods-via-powershell

You will also find a sample PowerShell script that can help your IT folks find the culprit, as part of the article.

And in case none of this helps, ask your IT folks to run a message trace against one such sample invite: https://learn.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/message-trace-modern-eac

Answer 2

Hi Shelby,

If calendar reminders in Outlook cannot be dismissed or keep reappearing, you can share this document with your IT admin and ask them to try the steps outlined in it: Calendar reminders in Outlook can't be dismissed or keep reappearing

They can also run resetfolders by pressing Win+R, type outlook.exe /resetfolders, and press Enter. This rebuilds your folder list from the mailbox, which clears out any orphaned folder references left over from the departed employee's mailbox being attached and removed

If the issue persists, please let me know the outcome and what steps your IT admin has tried so that I can assist further.