Below are the following steps to configure Outlook:-

Step 1: Go to the address login with your professional Gmail account

https://myaccount.google.com/lesssecureapps

and turn “Less secure apps” to “ON“.

Step 2: Open Outlook -> Go to File (menu at the top)

Then, just above the Account Settings button, click Add Account.

Step 3: A pop up will open  

Select Manual setup or additional server types.

Step 4: Enter Your Name

Enter your Email id

            Account type : select POP or IMAP

For POP

            Incoming mail server :- pop.gmail.com

            Outgoing mail server :- smtp.gmail.com

For IMAP         

            Incoming mail server :- imap.gmail.com

            Outgoing mail server :- smtp.gmail.com

In Logon Information enter your Email id (write your Gmail login information)

Gmail Id: [email protected]

Gmail Password:XXXXX)

Step 6: Click on More Settings and select the following tab Outgoing server and then Click on my outgoing server (SMTP) requires Authentication

Step 7: Click on Advanced Setting

Incoming port for IMAP:- 993 Outgoing port for IMAP : 587

Incoming port for POP:- 995 Outgoing port for POP : 465

IMP Step 8: If you are Using POP then, Inside More setting-> go to Advance -> Disable ‘Delete the file from server’ &  Enable ‘Leave a copy of message on the server’