Microsoft slips ads into Windows 10 Mail client – then U-turns so hard, it warps fabric of reality
Found on The Register on Sunday, 18 November 2018
The ads would appear at the top of inboxes of folks using the client without a paid-for Office 365 subscription, and the advertising would be tailored to their interests.
A now-deleted FAQ on the Office.com website about the "feature" explained the advertising space would be sold off to help Microsoft "provide, support, and improve some of our products," just like Gmail and Yahoo! Mail display ads.
Also, the advertising is targeted, by monitoring what you get up to with apps and web browsing, and using demographic information you disclose.
After Windows 10 brought ads into the start menu, now another piece of software from them is explored for future advertising. MS products turn into adware.