About the only viable response these days is SCIF.

Whether you like it or not, it’s almost the defacto for business collaboration.

Does it have an email/collab product line Outlook yet?

Edit: I just remembered that the New Outlook will be pretty cross-platform since it’s effectively OWA.

This should surprise no one. The reception was poor, delivery was poor. It’s a niche market item in an existing niche market. On top of that, the de facto spokesperson of Tesla isn’t well liked by a lot of potential buyers.