"Microsoft Office, like many companies in recent months, has slyly turned on an “opt-out” feature that scrapes your Word and Excel documents to train its internal AI systems. This setting is turned on by default, and you have to manually uncheck a box in order to opt out.

If you are a writer who uses MS Word to write any proprietary content (blog posts, novels, or any work you intend to protect with copyright and/or sell), you’re going to want to turn this feature off immediately.

I won’t beat around the bush. Microsoft Office doesn’t make it easy to opt out of this new AI privacy agreement, as the feature is hidden through a series of popup menus in your settings:

On a Windows computer, follow these steps to turn off “Connected Experiences”: File > Options > Trust Center > Trust Center Settings > Privacy Options > Privacy Settings > Optional Connected Experiences > Uncheck box: “Turn on optional connected experiences”"

https://medium.com/illumination/ms-word-is-using-you-to-train-ai-86d6a4d87021