I feel like it's such a niche thing. It's a feature that should be built into Outlook. Which is cool but it's the most boring thing ever once I finished it and nobody was banging down my door :)
Noticed people would often send out confidential email to the wrong person because they'd click the wrong auto-complete entry when they shift. This thing reads your email, figures out you meant to click the other "Bob", and warns you. And my place of work can't use it as it's too regulated and requires a bunch of SOC2 stuff that I haven't done.