How to Delete Phishing Meeting Requests in New Outlook?

This is definitely an issue Microsoft is aware of but hasn’t resolved yet. There aren’t any universal fixes at the moment. However, if your organization has a Microsoft Defender for Office 365 subscription, there are measures you can take to reduce these problems. I’d suggest checking out guides on enhancing calendar security or having your IT admin set up Mail Flow Rules that block external calendar invites while allowing specific exceptions.

Here are some links that provide more details:
1. [Learn about calendar security steps](https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-calendar-security-through-enhanced-remediation/4456876)
2. [Rules to prevent invites from external sources](https://learn.microsoft.com/en-us/answers/questions/5558001/how-to-prevent-calendar-invites-from-external-sour)

You're right, the new Outlook has some serious issues! Unfortunately, it doesn’t allow you to silently delete these phishing invites without sending a decline response. A couple of possible workarounds are:
1. Right-click the meeting in your calendar, select 'Delete', and look for the 'Delete without notification' option (but fair warning, it doesn’t always work).
2. If you’re using Defender for Office 365, you might want to explore using the Calendar Quarantine feature or create rules to automatically remove any suspicious invites. But yeah, this is a known limitation that many are frustrated with.