Outlook allows you to set up your own personal 'distribution lists'. This can be useful in cases where you might need to email a number of people (internally) such as a team of people.
To get to your distribution lists (also called 'Your contact lists'):
The below screenshot shows an example, of a 'contact list' when set up. This example has two contacts:
Creating a new contact list
To create a new contact list - click on the drop down arrow next to 'New contact' and choose 'New contact list'.
You will then need to name your contact list group, and add your contacts to the group.