After you log into the tablet remotely, find the driver's Gmail app. You should find it in a folder entitled "Google"
The first screen you encounter will be the account selection screen. Select the "Add another email address" option. Gmail will then provide a list of options and you will select the "Exchange and Office 365" option.
The next screen will prompt you to enter the driver's email address. After entering the address, select "Next".
The next screen will prompt you to enter the driver's email password. After filling it out, press "Sign In". The next screen will ask you to accept permissions. Click "Accept".
The next screen will prompt you to allow 2 different accesses. Allow them both. The next screen should confirm that the account has been created successfully. Press "Done".
On the following screen you will want to press "Take me to Gmail" at the bottom.
Once in the inbox, you can switch accounts by pressing the profile button in the top right and then by selecting the newly created account.
The email setup is now complete and the driver should be good to go.