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 favorite, search for the contacts and then right click on it to see the “Add to Favorites” 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.