To migrate contacts from the old to the new webmail sites, follow these steps:

  1. In the RoundCube webmail, click on "Address Book" in the top right hand corner of the window.

  2. Click the Export button on the top left. This will download a file with your contacts. You can then save the file in your downloads or desktop. RC Export Screenshot

  3. Open the Rainloop webmail and click on the Contacts button in the top left. RL Contacts Screen Shot

  4. In the contacts menu select Import and upload the file downloaded from Roundcube.
    RL Import Screen Shot