Apple Mail.app renders messages that have accented characters incorrectly

Consider the following scenario:

• You send an email message from the Microsoft Outlook for iOS or Microsoft Outlook for Android mobile client.
• The message contains characters that have diacritical marks (for example, ü and ä).
• A recipient reads the message on the native iOS Mail.app email client.

In this scenario, the message text is rendered incorrectly and seems to contain unexpected double-byte characters (for example, 甆甌甍).

Note This problem may also occur by using mail delivery methods other than Outlook for iOS or Outlook for Android.

Apple has been made aware of this problem and is currently investigating it. For more information, contact Apple Support through the following Apple website:

https://www.apple.com/contact/

Microsoft has researched this issue and verified that the conversion and rendering problem does not occur in the Outlook for IOS client or on the server that is running Microsoft Exchange Server and is used to deliver the affected mail.