To REMOVE the existing mail account:
Step 1 of 4
Open the Outlook app on your mobile phone and click the settings icon in the upper left. (Your settings icon may look like 3 dots, or a gear depending on the version of app you have installed.)
Step 2 of 4
Select the company email account. (You account may be name “ATFT email” or simply “Exchange”. For most of you, it will be the only account listed.)
Step 3 of 4
Click Delete Account.
Step 4 of 4
Close the Outlook app.