Before you start configure the mailbox, make sure there is not same mailbox already configured on your mobile. If so, please remove this mailbox from your device. 

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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.

Device Settings > Accounts & Passwords

Tap "Add Account"

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Select Exchange.

Choose Exchange

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Enter your email address and a description of your account. Tap Next.

Exchange Sign In

Tap Sign In.

Tap Sign In if using O365 or tap Configure Manually if you have your organization's server settings.

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Enter the password associated with your email account. Tap Sign in or Next.

Enter your O365 work or school account password.

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The Mail app may request certain permissions. Tap Accept.

Tap Allow if prompted to give permission.

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Choose the services you want to sync with your iOS device and tap Save. You're done!

Account sync settings