If you are closing your HostBaby account, you may want to back up your email addressbook first.
To do that, login to your webmail here: https://mail.hostbaby.com/
Once logged in, click on the Address Book icon. Right above the first column, you'll see an Export button. Click that, and a file - contacts.vcf - will be downloaded to your computer.
If you need to convert your .vcf to a .csv file to use elsewhere, you can do that in a very simple manner here: https://tribulant.com/vcard-csv/ (This also works for converting an Apple Mail addressbook to a .csv file).