The deciding factor is the message format. Rich-text messages put the
attachment inline, but are not compatible with non-Outlook recipients. HTML
and plain text messages are not inline.

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Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> In replying to some messages the attachment is placed in
> the body of the message where the cursor is and in others
[quoted text clipped - 3 lines]
>
> Thanks