In order to import or export information from Outlook into/from your Webmail system, follow the instructions below:
First, open Outlook and find the File option.
From there, look for Import/Export.
Choose to Export to a File
Select the Comma-Separated Value (CSV - Windows)
Select your contact folder and choose where to place the file (desktop by default)
Click Finish
Now, switch over to the Webmail system and continue to log in.
Click on Contacts
Click Import/Export
Browse to find the file you just saved
Click Load/Ok and then Continue
Tidy up any new entries and import the entries