Suspicious calendar invite

Hi,

Today, when I open my Outlook, I got a 16-week overdue calendar invite reminder pop-up (screenshot attached). The calendar event is dated 23 Aug 2025.

From admin email trace, I found out that the email was sent 19-Dec (today).

Suspected of phishing or scam activity, I attempted to open the calendar event to view the content and the sender's email address.

After I double click on the calendar invite, the email kind of hang/loading. I immediately go to Windows Task Manager > End Task, afraid that there is some malware running/executed.

Since I did not manage to open the email, without clicking on any URL links or Attachments, will there be any possibility of any infection (malware/spyware...) by just opening the calendar invite?

Thanks.