I have the same exact issue. I am synching with corporate outlook no problem except for this.
It looks like when I reply to messages, the recipients receive the message that contains the original text embedded or inline with the response email. However, when I forward an email, the original message text is received as an EML attachment file. This happens for any recipient of my forwarded message whether in or out of our company. And if in the company, the attachment is stripped cause the server policies restrict that attachment file type.
I notice that when you hit reply or forward, the original message text is in an area called QUOTED TEXT which has an 'x' box to remove the original text. I am assuming it is including the original text as as attachment and not embedded. I cant find any settings to change this which I used to have on my bberry and I do have in the pure outlook client. And I notice on motorola site that it says that Outlook embedded EML is not supported.
However, again, even though when replying it is shown as quoted text section, recipients do get it within the message with no attachment. It is only happening when forwarding messages.
Any ideas? The only solution I can do is always use reply, and just remove the original sender and add the recipients who I want to forward to. Which is annoying. And then if I have to deal with forwarding attachments? not possible since you cant attach files to emails.