From a computer, log into FirstClass and open your Contacts/Address Book.

Then go to File -> Export

Select ‘All Contacts’ and the vCard format. Click ‘OK’ and save the file to your computer Desktop.

Log into Zimbra and go to the Preferences tab and then to Import/Export.

Choose the vCard file you just exported from FirsClass.

Zimbra will know it’s a Contacts file and default to importing it into you Zimbra Personal contacts, you click the ‘Contacts’ button to choose a different destination if you wish.

You’ll receive a notification of success as it could take a few minutes with very large imports.