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

Posted on 2014-11-06
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Last Modified: 2014-12-04
In outlook 2010, a scheduling user is creating an appointment and sending via exchange 2010 to a users yahoo.com email account.

I Ran the Microsoft fix it from http://support.microsoft.com/kb/958012 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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Question by:oriontech2
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gheist earned 500 total points
ID: 40427134
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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