Export contacts from Outlook.com to a CSV file
You can export your contacts from Outlook.com and then import them into other email apps such as Gmail or Yahoo, or other versions of Outlook.
Select People at the lower left corner of the page to go to the People page.
On the toolbar, select Manage > Export contacts.
Choose to export all contacts or only contacts from a specific folder, and then select Export.
At the bottom of the page, select Save to save "contacts.csv" in your default Downloads folder. Or, select the arrow next to Save and select Save as.
Now that your contacts are copied to a .csv file, you can import the contacts into other email apps or other versions of Outlook.