I have no idea. After I purchased IncrediMail Plus and IM Backup, I lost almost 3000 Emails, so I demaned a refund and they refunded me. IncrediMail 2 is a lot better, one can select "Files" and "Data and Settings Transfer Wizard". This will backup all of your emails accounts and all of your contacts, plus all the notifiers, etc., one has downloaded, all in one or two files on an external drive I suggesst. That way, if you had to reformat, you could install ImcrediMail 2 and Import from the file one had previously saved.
I have already mentioned to the programmers of IncrediMail that the new Backup program has flaws.
When I had it, it seemed to be restoring all my email and accounts, taking 15 - 20 minutes, but after it finished, I had no Email or Contacts.
If you purchased IncrediMail Plus and the Backup program, you should ask for a refund. Anoither problem with the new Backup program only allows to backup every email accounts one at a time. Like, I have two, my 'family & friends' Email acct., the my main account. With the new Backup, I had to backup only one Email acct, then backup the other account, but that was a waste as when I restored them, they didn't load up when I loaded IncrediMail Plus.