So a really strange one here!
I have a user that uses OWA 2010 100% of the time and since upgrading to 2010 from 2003, she has been receiving complaints from some recipients receiving the email but with no content. (no text, nothing). I tested what she was doing on the admin account of OWA and sent myself (external account) an email. When I received it in outlook 2013, it displayed fine. However, when i view it on my iPhone, it gets a message snippet which it displays in the list of emails but upon opening the email, nothing is displayed. I have reviewed the email source and nothing looks different.
Does anyone have any ideas here? Really got me stumped this one! :)