did anyone find an answer to the original question?
I just gave my Galaxy Nexus to my husband to use and when he tried to open jpg attachment, he got the same message -- that he needed to download an app to be able to open the attachment.... but they don't say what app to get in the Playstore.... I received the same email with the same attachment on my Galaxy Note 2 - and had no problem opening the attachment... its just a picture... help....