I just bought a new ASUS Zenbook with Windows 8.1. I'm now having problems in that my messages on the ISP (clear.net.nz) are not being deleted after I have downloaded them onto my computer. As a result, when I check emails on my mobile all of the messages that I have already downloaded onto my computer (and read) are downloaded onto my mobile as well. I'm on a limited data plan so I do not want this to be happening. As far as I can tell my new computer is still set to POP3 rather than IMAP. Any suggestions on how to sort this out?