Message containing special characters sent from a Windows device appear incorrectly in an IMAP or POP client

Message containing special characters sent from a Windows device appear incorrectly in an IMAP or POP client.
A Windows phone sends an email with special characters and is received and viewed in the GroupWise Client and looks correct. When accessed from Outlook or Gmail via POP/IMAP it looks incorrect; however, an Android client sends an email with special characters and is received and viewed in the GroupWise Client and looks correct. When accessed from Outlook via POP/IMAP it looks correct as well.

At the time of writing this TID, there is no officially available patch and no workaround steps available.

Duplication steps:

1. User sends an email from their Windows phone.
2. Mail is received fine and the special characters look right in the GroupWise client.
   
3. Mail is then opened from an external client via POP and/or IMAP (Outlook, Gmail, etc.) and the special characters appear incorrectly.