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Did you try disable antivirus?
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No but other users with identical setups do not have thta issue.
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No but other users with identical setups do not have thta issue.

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In both cases outlook 2010 users excel and word attachments no larger than 2 mb. &nbsp;<br />
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Recipient has only win.dat attachment. &nbsp;I've tried sending all mail as plain text / HTML and changed the registry key disable tnef to value 1 <br />
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With no luck.
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In both cases outlook 2010 users excel and word attachments no larger than 2 mb.  

Recipient has only win.dat attachment.  I've tried sending all mail as plain text / HTML and changed the registry key disable tnef to value 1 

With no luck.

Winmail.dat

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.