iPhone 4 (iOS7) from POP3 to IMAP?

Can you change a windows live email account from a POP3 to IMAP? If not, please advise to the incoming and outgoin server names as I've been tinkering with something I know little about and need to reset to original setings.

This entire episode began when it'd get the error message when deleteing an email, "unable to move to folder" Never had this issue with iOS6.

JBG