One of my user's account got blocked because his email account used more than 5gb. Now he reduced the size of his mailbox to 3.9Gb but I can't unlock the account. When going to "Troubleshooting" > "Blocked Accounts" and trying to unlock the account I am getting a message saying something like "Operation allowed only to paid account" (Translated from Spanish). Does this mean that a free account once blocked can not be unblocked ?