The quickest and easiest way to setup your company email is by installing the Microsoft Outlook app onto your iOS device. It will ask you to enter your email address and password and configure everything else for you.
If you prefer to use the built in iOS Mail app, follow these instructions.
Go to your iPhone or iPad's Settings > scroll down and tap Accounts & Passwords > Add Account.
Note: If you're on iOS 10, go to Mail > Accounts >Add Account.
Select Exchange.
Enter your email address and a description of your account. Tap Next.
Tap Sign In.
Enter the password associated with your email account. Tap Sign in or Next.
The Mail app may request certain permissions. Tap Accept.
Choose the services you want to sync with your iOS device and tap Save. You're done!