[lambda_dn]

Evidence that Microsoft use Actix? Im sure if they did you would have posted a link.

[Dowwie]

There wouldn't have been actix v1, actix-net or actix-web if it weren't for MSFT. They funded the work. They're may not use them anymore.

[pjmlp]

I remember reading somewhere that the original author was using it for some use cases at Azure, but I doubt it is anything public facing.