change mail format for contacts

For the iphone, attachments come over as winmail.dat and the solution is to
change the mail format in options, mail format to HTML.

Also the individual contacts needs to be changed by double clicking the
email address and changing the internet format to Send Plain Text only.

After these changes are made, the attachments come over fine. I have had
problems with this issue with some contact before. I would love to be able to
make this change globally instead of having to edit all contacts. Can this be
done.