I'm pretty sure Calibri is included with Windows since Vista (along with Segoe UI)- they wouldn't just simply stop bundling it. But if that would happen for wha

I'm pretty sure Calibri is included with Windows since Vista (along with Segoe UI)- they wouldn't just simply stop bundling it. But if that would happen for whatever reasons then probably Office would ask user if missing font should be downloaded and installed on the system, to provide "best experience" in viewing and working with the document that uses it.