I have installed Zimbra 7.1.4. The users are using POP3 to download their emails. However, when anyone enters in webmail, there are many messages in SPAM folder. I think there is some default config to use IMAP. The problem is that some users have messages in SPAM folder that don't are SPAM, and they don't know about this, because they don't use webmail, only clients like Outlook or Thunderbird + POP3.