Microsoft Invoice has transitioned to a cloud-based product, so again, they didn't end support. You might not like the new purchasing model, but that's very much different than them burning the product to the ground.
https://einvoice.microsoft.com/Default.aspx?MSIStateKey=f513...
Sharepoint is the backend for onedrive for business, and fully integrated in to Teams. What on earth would make you think it's going away?