Step 1: Open Outlook 2010 and select File
Step 2: Click Add Account.
Step 3: Check Manually configure server settings or additional server types
Step 4: Manually configure server settings in Outlook 2010
Step 5: Select Internet E-mail
Step 6: Fill in the fields on the screen

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Account Type: Select POP3
Incoming: outlook.office365.com
Outgoing: smtp.office365.com

Select POP3 after the Incoming mail server name.
User Name: Enter in the full email address
Password: Enter in the password for that specific email address
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Step 7: Click More Settings
Step 8: Select Outgoing Server and then My outgoing server (SMTP) requires authentication

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Select Advanced.
For IMAP use 993  - SSL  enabled  
Outgoing SMTP port - 465  SSL enabled
For Root folder path enter INBOX with uppercase letters.
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Step 9: Click “Next” and then click “Finish” to complete the email account setup.

Note:  Leave a copy of messages on the server:
i) Place a tick in this box if you want to leave a copy of your downloaded mail on the server (recommended if you access this account from another device, such as a mobile phone).
ii) Remove the tick if you would prefer to have the messages deleted immediately after they have been downloaded.