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For Outlook 2010:
In the Contacts Folder
To turn off TNEF, follow these steps:
Open the recipient's record in the Contacts folder.
Double-click the recipient's email address.
The Contact Card appears. Click View more options for interacting with this persona, and then click Outlook properties.
Choose Send Plain Text only in the Internet Format list.
To send in TNEF, follow these steps:
Open the recipient's record in the Contacts folder.
Double-click the recipient's email address.
The Contact Card appears. Click View more options for interacting with this person , and then click Outlook properties.
Click Send Using Outlook Rich Text Format in the Internet Format box.