Please follow the steps to configure outlook 2016 using IMAP.
Step 1: Open Outlook on your computer and click File option. Then click Add account to setup a new account.
Step 2: Type your email address for which you want to configure outlook. Then click Connect.
Step 3: Choose the account type.
Step 4: It will automatically detect the server setting. If not, then follow the settings as below(Incoming and outgoing mail server should be server name. see recommended mail settings). Then Click Next to continue.
Step 5: Enter your username and password of email address. Then click OK to complete setup.
Step 6: Once the email account is setup, you need to add some additional settings. Open your outlook and click File.
Step 7: Then click Account settings.
Step 8: Select the email account which you configured and click Change.
Step 9: Check the mail settings, which should be as per the screenshot (Incoming and outgoing mail server should be your server name. see recommended mail settings). Once done, click More settings.
Step 10: Click on Advanced tab. Then set the Root folder path as INBOX. Click OK to save.
Then click Next to continue.
Step 11: Outlook will test the incoming and outgoing server settings by sending test email. Click Close when the both the status shows as Completed.
Step 12: Click Finish to Continue. Now you can check all the mails.