Scheduling and managing events using Outlook.com calendar
I am having the same issue, "Spam Calendar Invites" in Outlook 365. The solution I found was to go into Outlook Options and uncheck "Automatically process meeting requests and responses to meeting requests and polls". To get there, do the following:
Mail Icon
File
Options
Scroll down to Tracking
Un-ckeck "Automatically process meeting requests and responses to meeting requests and polls"Hope this helps.
Scroll up to my post of Dec. 14 and see the screenshot you suggest. It doesn't work. Many others tried and were disappointed too.