Generating the CSV

To export the .csv file from Outlook 2013, under the File tab click on Open & Export:

From there launch the Import/Export wizard:

Choose Export to a file and then Comma Separated Values (CSV):

You will be presented with a list of Outlook folders.  Selected a contact folder and then click Next to save to a .csv file:

This should produce a .csv file similar to the attached.

See the CSV Import File Format solution for details on supported columns when you are ready to import.