Hello,
I have a Exchange 2010 server and when a client (OWA or Outlook, Mail.app...) reply or forward a message with an attachment like xlsx, docx... there is a problem with encoding.
When the message should be with accent (é, à, è, ç....), this message is displayed with black diamond with question mark inside.
I can reproduce the problem from the company to any domain. (The common factor is always the exchange server.)
(From exchange address to gmail. From exchange address to exchange address. From gmail to exchange address), Because it's always on the reply or forward with attachment.
I don't know how to solve this problem
Thank you in advance,
Keisuke