We have some users who cannot open e-mails sent from Exchange 2010. The users are in the same post office. I have reset the client options, but still same issue. I checked on the mime of the two users to see the difference. With user 1, there are no problems opening HTML files and here is what I see in the mime.

USER 1

"--_000_217E0210190A6141B48A272001F8D329016A422DLVNEX C02sisecam_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

TEST
--_000_217E0210190A6141B48A272001F8D329016A422DLVNEX C02sisecam_
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

And for user 2 who has problems, the mime is ;

USER 2

--_000_217E0210190A6141B48A272001F8D329016A4207LVNEX C02sisecam_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

TEST
--_000_217E0210190A6141B48A272001F8D329016A4207LVNEX C02sisecam_
Content-Disposition: attachment; filename="winmail.dat"
Content-Transfer-Encoding: base64
Content-Type: application/ms-tnef; name="winmail.dat"


So where could the problem be ? Help