Support article explaining how to export contacts or address book through Roundcube Webmail.
You can import and export your Address Book or Contacts via Webmail.
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Log into Webmail
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In the top-right of the web page, click on Address Book
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Click on the Export link in the top left of the page
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Your Web Browser will prompt you to download a file called rcube_contact.vcf. This is your address book in vCard format.