Outlook 2007 always sending winmail.dat - have tried every settingI can find.

[s]

I have a workstation with Office 2007. Outlook 2007 has also has the
Outlook CRM client installed. I have tried changing all the settings I
can find and it still sends out with winmail.dat files.

Have changed to plaintext sending - it shows plain at the top of the
window when I create a new mail.
Have also changed the properties for Contact e-mail addresses.

Tried sending with CRM tracking and without and it makes no difference,
with an attachment or without.

Anyone got any suggestions?

Cheers