winmail.dat appears to a user's yahoo account when an appointment is sent to them.

In outlook 2010, a scheduling user is creating an appointment and sending via exchange 2010 to a users email account.

I Ran the Microsoft fix it from on the computer with outlook, and manually changed the outlook mail setting to plain text. neither resolved the problem.

Is the issue in Exchange server?
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gheistConnect With a Mentor Commented:
You must disable exchange rich text everywhere on exchange - users and connectors. Then it will stop poisoning world with TNEF rubbish
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