First thing you need to make sure you have is a local copy of your Google Contacts from your CBBMail account. Follow these instructions to download a copy of your Google Contacts.

To import your contacts to RoundCube

  1. Log into RoundCube
  2. Click “Contacts”
  3. Click “Import”
  4. Click “Browse”, navigate to and select your save contacts file
  5. Click “Import”

After a few moments, the page will refresh and display your Contacts.