A new calendar feature, called Interesting Calendars, is rolling out to Office 365 Exchange Online and Outlook.com users (on the new server). The current calendars offered are sports-related, with major sports such as MLB, (American) Football leagues, Hockey, Soccer, Cricket, Auto Racing, and many more as well as the Olympics. In addition to showing upcoming events, scores are added to past events.
Select the sport, then the team to add the calendar.
To delete Calendars, go into the Interesting Calendar pane, click Manager then click the X next to the calendars you wish to delete.
Like the Birthday and Holiday calendar, these calendars are added as an additional calendar, so you can turn them off as needed to reduce clutter in your calendar display. The calendars sync to Outlook and devices.