Remember that email you sent telling someone you’d send them something by Friday? Oh. You forgot. Well now you won’t … with Cortana. Cortana can now help you remember these things. She will give you reminders.
Just launched last week, Cortana’s reminders work on Windows 10 and will eventually support Android and iOS. It works with Outlook.com and Office 365 work and school addresses with support for other email services coming soon.
You can also have Cortana add a reminder to your list by talking to her. Unfortunately, you cannot link them all yet if you have an Office 365 Home edition. Hopefully that is in the future as well.