Query about automatically adding calendar invites

So I’ve been playing around with Nextcloud for a while now and whilst I’m always finding new things (most of the time resulting in a change of underwear with excitement :wink: ) and new ways of doing things (I’m planning on rolling this out to an architects firm of 50 + internal users and 100 + external users!),

I’d love to know if there’s a way of automatically adding calendar invites from Office 365, iCloud & Gmail into the default calendar app from the default mail client.

I’d also love a way to be able to have the ability to have “shared” folders appear in the default mail app that emails could be “filed” into. But I’m sure that’s a project that will take a long time haha.