Earlier quoted context omitted.
Install Office, use an App that tracks bandwidth use, uploads and downloads, PER app, and be amazed with how many MB/s of data Office sends to Microsoft.
Yeah, I switched to the web version of outlook when I noticed (via little snitch) that the desktop app was sending 100's of MB upstream. No idea why it'd need to send much of anything in that direction.
I don't understand what you believe this gained you.