When an unprocessed invitation that has the option to decline responses, i.e. it gives the user the action to add to calendar when in open mode, there is no option on the view-level right click menu to process the “add to calendar”.
Subject: When you open the entry…
Do you have the Accept, Decline, etc options, the Add to Calendar option, or the Update Calendar option?
Subject: When opened the Add to Calendar option is visible