You can export a single Outlook contact as a vCard file and then import that file into Zendesk Sell.
To export a vCard file from Outlook:
1. Open your Outlook contacts and select the contact you’d like to export.
2. From the File menu choose Save As.
3. Select vCard format (*.vcf) and save the file to your desktop.
After you’ve exported your contact as a vCard file you can import it into Sell.