Why am I suddenly receiving spam calendar invitations/appointments in Outlook (Microsoft 365 Family).

None of these suggestions fixes the problem. Not efficient to be playing whack a mole

Will need to switch to other email. Also I do have a paid subscription to office 365, so this is a Microsoft weakness

Block that sender from your iPhone like you would a telephone number

I just uninstalled Microsoft Calendar. Problem solved. But I don't understand how things were showing up on my calendar and popping up notifications if I didn't open any emails with such events/attachments.

I use Thunderbird as my email client. Could Microsoft be scanning my messages for calendar events?

What a tragedy........There isn't any way to report as "junk" or "spam" etc........They only option I have in Outlook 365 is "DELETE" Then when you delete the invite Microsoft actually asks you the IGNORANT question, "do yo want to notify the event organizer." WHAT???? It automatically defaults with your mouse to the "YES" tab. Good God. I don't think it gets anymore irritatingly ignorant then this. The BILLIONS of DOLLARS Microsoft makes you'd think that they'd take care of their consumers and come up with a better security plan for their product. I wish I could uninstall outlook but we use it for work as well I use it for home.

These actions are not relevant to MacOS as usual. This is a constant source of aggravation, outdated or outright incorrect information when it comes to MacOS. If MSFT doesn't want to support MacOS, why do they keep selling products for it? I'm done with MSFT. Nothing but problems ever since I made the stupid mistake of signing up for Office & Outlook 365. Total waste of my money. Microsoft should be able to stop this from happening but they don't even give a damn.

That is exactly what I did, I now use my gmail and apple calendars.