We recommend you use Outlook Mobile App for Apple

  1. Open Outlook for iOS, the icon should look like this:  
  2. Tap Get Started
  3. Enter your Email address, then tap Add Account
  4. Enter your password, then tap Sign in.
  5. If the app asked for server name, type Autodiscover.worldposta.com
  6. If the app asked for permissions to synch Calendar, tap Yes or Allow
Now, you’re all set.