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Exporting Contacts from Horde

Exporting Contacts from Thunderbird

Log into Outlook Online https://outlook.office.com/ if you are not already, or else navigatye there by choosing "Outlook" from the list of apps in top right hand corner. Then select "People" from the left-hand main menu.
On the top ribbon click "Manage Contacts" and then "Import Contacts."
Upload the relevant CSV file of your contacts from the step above