I need to switch an existing POP3 e-mail account to IMAP in LiveMail 2011 operating in Windows 7 Home Premium on a desktop PC.  There are  numerous existing e-mails in the account which I cannot lose. How do I do this?

And then, how do I set up Outlook on a Windows 8 tablet to sync with that same account, also without losing existing e-mails?

Thx!