The To-Do Bar is turned off by default in Outlook 2013. You can turn it back on via the View-> To-Do Bar button in the Ribbon. Note that it now also holds the option to show your contacts. To mark a contact as a favourite, search for the contacts and then right click on it to see the “Add to Favourites” option. You can also directly right click a contact from your Contacts folder.
The reason why it is off by default is to allow for more horizontal viewing space and because the individual To-Do Bar modules are also available merely by hovering on the word Calendar People or Tasks at the bottom of the Outlook window.
Calendar Peek feature in Outlook 2013. It also works for the People and Tasks module.
Note:
The feature to show appointments for upcoming days in the Calendar Peek and To-Do Bar has been restored first in Hotfix KB2768340. This fix will also be included in regular updates and to Office 365 subscribers soon.
