•You can send and receive email from POP accounts using Outlook which is free as part of Windows RT 8.1.
•You can use an Outlook.com account to send and receive email from another account(even one that uses POP). Then, add your Outlook.com account to the Mail app to read and send email from your POP account.
•Use your email account provider’s website to get to your messages. For example, if your email account is from Contoso, go to www.contoso.com and sign in.
•Look for an app in the Windows Store that supports adding email accounts that use POP.