First , Enable pop function
1. Sign in to Gmail.
2. Click the gear in the top right .
3. Select Settings.
4. Click Forwarding and POP/IMAP.
5. Select Enable POP for all mail.
6. Choose the action you'd like your Gmail messages to take after they are accessed with POP.
7. Click Save Changes.

Second, Configure your POP client - Outlook
1. Open Outlook
2. Click the Tools menu, and select Accounts or Account Settings...
3. On the E-mail tab, click New...
4. If you are prompted to Choose E-mail Service, select Microsoft Exchange, POP3, IMAP, or HTTP, and click Next.

5. Use the information below to configure POP with your mail client.


Incoming Mail (POP3) Server - requires SSL: pop.gmail.com
Use SSL: Yes
Port: 995
Outgoing Mail (SMTP) Server - requires TLS or SSL: smtp.gmail.com
Use Authentication: Yes
Port for TLS/STARTTLS: 587
Port for SSL: 465
Server timeouts Greater than 1 minute, we recommend 5
Full Name or Display Name: [your name]
Account Name or User Name: your full email address (including @gmail.com or @your_domain.com)
Email Address: your email address (username@gmail.com or username@your_domain.com)
Password: your Gmail password

6. Backup Outlook Data File, An Outlook Data File (.pst) contains your backed-up email messages, and can be stored in one following default locations based on the client version and the Outlook account type:
However you will need to keep the .PST file for email archiveĀ 

Windows version

Location

Windows 8

drive:\Users\<username>\AppData\Local\Microsoft\Outlook


or


drive:\Users\<username>\Roaming\Local\Microsoft\Outlook


Windows 7 / Windows Vista

drive:\Users\<username>\Documents\Outlook Files

Windows XP

drive:\Users\<username>\My Documents\Outlook Files