POP vs IMAP ?
POP stands for “Post Office Protocol.” POP is a one-way communication path. This means that when you access your email from your computer or other local device, your email client (such as Outlook or Thunderbird) will save a local copy of the email to your computer, then delete the original from the mail server.
Email accessed using POP ties it to a specific computer or device, thus you will be unable to view your webmail from multiple sources. However, POP is useful for storing local copies of email to be read offline or when not connected to the internet.
IMAP – stands for “Internet Message Access Protocol.” IMAP is a two-way communication path. This means that when you access your email from your computer or other local device, any changes that are made will be synchronized with your webmail on the mail server. IMAP provides a better method to access your mail from multiple devices, say from work, home, and your mobile, through two-way syncing capabilities between your mail clients and the mailbox. However, because IMAP saves all your messages on the server, be sure frequently clean up your mailbox, deleting old messages and saving the ones you want to keep to a local computer.
To configure POP3/IMAP mail account on iPhone/iPod or iPad click here
To configure POP3/IMAP mail account on windows Phone 8 click here
To configure POP3/IMAP mail account on Android click here