Hi,
Whats the exact mean of pull data from the web-client using POP3 to the Exchange? Do you mean the Outlook client connects to Exchange 2013 with POP protocol?
If that is the case, please enable and configure the POP in your Exchange server by the following article:
https://technet.microsoft.com/en-us/library/bb124934(v=exchg.150).aspx
Generally, POP3 was designed to support offline mail processing. With POP3, email messages are removed from the server and stored on the local POP3 client unless the client has been set to leave mail on the server. For more information
about POP3 in Exchange 2013, please refer to:
https://technet.microsoft.com/en-us/library/jj657728(v=exchg.150).aspx
Regards,