I'm opening a case with Microsoft as well to see if something is wrong on their end. Here's the issue...If I send an email from OWA, with eml file attachments, everything works as expected.If I send an email from Outlook 2011 or Mac Mail, with eml file attachments, the attachments do not come across.I'm sending to the same email address.Issue is consistent.Other file types; pdf, docx, xlsx work as expected from both OWA and either client.Has anyone seen something like this before?