You can open your messages from Gmail in other mail clients that support POP, like Microsoft Outlook.
Ref: https://support.google.com/mail/answer/7104828
IMAP and POP are both ways to read your Gmail messages in other email clients.
IMAP can be used across multiple devices. Emails are synced in real time.
POP can only be used for a single computer. Emails aren't synced in real time. Instead, they're downloaded and you decide how often you want to download new emails.
On your computer, open Gmail.
In the top right, click Settings .
Click Settings.
Click the Forwarding and POP/IMAP tab.
In the "POP Download" section, select Enable POP for all mail or Enable POP for mail that arrives from now on.
At the bottom of the page, click Save Changes.
Go to your client, like Microsoft Outlook, and check these settings.
Incoming Mail (POP) Server
pop.gmail.com
Requires SSL: Yes
Port: 995
Outgoing Mail (SMTP) Server
smtp.gmail.com
Requires SSL: Yes
Requires TLS: Yes (if available)
Requires Authentication: Yes
Port for TLS/STARTTLS: 587
If you use Gmail with your work or school account, check with your administrator for the correct SMTP configuration.
Server timeouts
Greater than 1 minute (5 is recommended)
Full Name or Display Name
Your name
Account Name, User Name, or Email address
Your email address
Password
Your Gmail password
Set up IMAP and change your SMTP settings to read Gmail messages in other mail clients, like Microsoft Outlook and Apple Mail. When you use IMAP, you can read your Gmail messages on multiple devices, and messages are synced in real time. You can also read Gmail messages using POP.
Ref: https://support.google.com/mail/answer/7126229
Note: To avoid temporarily locking yourself out of your account, make sure you don't exceed 2500 MB per day for IMAP downloads and 500 MB per day for IMAP uploads. If you're setting up a single IMAP account on multiple computers, try taking a break between each setup.
On your computer, open Gmail.
In the top right, click Settings .
Click Settings.
Click the Forwarding and POP/IMAP tab.
In the "IMAP Access" section, select Enable IMAP.
Click Save Changes.
Use the table below to update your client with the correct information. For help updating your settings, search your email client's Help Center for instructions on setting up IMAP.
Incoming Mail (IMAP) Server
imap.gmail.com
Requires SSL: Yes
Port: 993
Outgoing Mail (SMTP) Server
smtp.gmail.com
Requires SSL: Yes
Requires TLS: Yes (if available)
Requires Authentication: Yes
Port for SSL: 465
Port for TLS/STARTTLS: 587
Full Name or Display Name
Your name
Account Name, User name, or Email address
Your full email address
Password
Your Gmail password
Outlook Configuration with Gmail id