// Create an array of recipients for the email.
NSArray* emailRecipients = @[@"example@email.com",@"example2@email.com"];

// Create a mutable string to hold all of the recipient email addresses and add the first one.
NSMutableString* emailTo = [[NSMutableString alloc] initWithString:emailRecipients[0]];
// Loop through all of the email recipients except for the first one.
for (int index = 1; index < emailRecipients.count; index++)
{
    // Add a semicolon and then the email address at the current index.
    [emailTo appendFormat:@";%@",emailRecipients[index]];
}

// Get the email subject from the subject text field.
NSString* emailSubject = fieldSubject.text;
// Encode the string for URL.
NSString* encodedSubject = [emailSubject stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLHostAllowedCharacterSet]];
// Get the email body from the body text field.
NSString* emailBody = fieldBody.text;
// Encode the string for URL.
NSString* encodedBody = [emailBody stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLHostAllowedCharacterSet]];

// See if the subject or body are empty.
if (![emailSubject length] || ![emailBody length])
{
    // Exit.
    return;
}

// Create a string with the URL scheme and email properties.
NSString *stringURL = [NSString stringWithFormat:@"ms-outlook://compose?to=%@&subject=%@&body=%@",emailTo,encodedSubject,encodedBody];
// Convert the string to a URL.
NSURL *url = [NSURL URLWithString:stringURL];
// Open the app that responds to the URL scheme (should be Outlook).
[[UIApplication sharedApplication] openURL:url];