This article will help you to import and export contact in Vcard format.
Step 1: Sign-in the Webmail
Insert your Email Address and your Password to log-in the Webmail.
Step 2: Choose Roundcube
You must choose the Rouncube image as show in the image below. 
Step 3: Address Book
Just click on the Address Book button and you will see list of your contacts. 
Step 4: Import Contacts
Choose import contact at the top of the page. Upload the Vcard file and you’re done!
Step 5: Export Contacts
Back to Address Book page and choose export contact if you want to export all of your contacts. Choose one by one of your contacts if you want to export individually.
