Use the following configuration settings for iPhone, Droid, or Windows Mobile devices.
1. Click More Details on the first screen.
2. In the Sign-in address text field, enter your email address.
3. In the Password field, enter your password.
4. Leave the Username field blank.
5. Switch the Auto-Detect Server mode to “OFF.”
6. Enter the Internal and External server names in the appropriate fields (same for both):