Step 1: Click Start and select Control Panel.
Step 2: Search for Mail and click Mail (Microsoft Outlook 2016) (32-bit).
Step 3: From the Mail pop-up, click Add button.
Step 4: Enter the new Profile Name and click OK.
Step 5: Choose Manual setup or additional server types radio button and click on Next button.
Step 6: Select Microsoft Exchange Server or compatible service and click Next.
Step 7: Enter the Server Settings:
User Name: Your Office 365 complete email address
Step 8: Click More Settings…
Step 9. Click Security tab and do the following:
Encryption – Uncheck Encrypt data between Microsoft Outlook and Microsoft Exchange
User identification – Uncheck Always prompt for logon credentials
Logon network security – Select Anonymous Authentication
step 10: Click Connection tab. Check the box Connect to Microsoft Exchange using HTTP and then click Exchange Proxy Settings…
Step 11: In the Microsoft Exchange Proxy Settings, do the following:
Use this URL to connect to my proxy server for Exchange – Enter outlook.office365.com
Connect using SSL only – Check the box
Only connect to proxy servers that have this principal name in their certificate – Check the box and enter msstd:outlook.com
On fast networks, connect using HTTP first, then connect using TCP/IP – Check the box
On slow networks, connect using HTTP first, then connect using TCP/IP – Check the box
Proxy authentication settings:
Use this authentication when connecting to my proxy server for Exchange – Select Basic Authentication
Step 12: Click OK.
Step 13: Click Next.
Step 14: In the Windows Security window, enter your Office 365 complete email address and password. Remember my credentials is optional, tick the check box if you want Outlook 2016 to remember your username and password. Click OK.
Step 15: Click Finish.
Step 16: A pop-up window will show up notifying you to close your Outlook. Click OK button.
Step 17: Close down your Outlook 2016.
Step 18: Open Outlook again.
Step 19: Outlook will load your profile and will ask you to enter your password to log in.