It started way before GMail client. OWA was the first application to partially manipulate the UI on the client. GMail was the first decent app doing it in a mo

It started way before GMail client. OWA was the first application to partially manipulate the UI on the client. GMail was the first decent app doing it in a modern way. Even AJAX is invented for OWA. https://garrettsmith.net/blog/archives/2006/01/microsoft_inven_1.html https://garrettsmith.net/blog/archives/2006/01/microsoft_inv...