Ability to set forwarding rule send calendar invite attachments (.ics) to another email.

To the "with attachment" option, add a way to designate the file type, so that only files with the .ics extension are forwarded.

I need to use outlook as my calendar because it integrates into booking tools, such as Calendly. The best option I've found is to forward an invite that comes to my proton mail and forward it to my outlook account, where I then can add it to my calendar (this will also work for updated/modified invitations).