Hallo Dmitry,

In general, that property on the attachment is set by Outlook depending on
what outlook thinks that attachment is (such as an image used by the HTML
body).
Have you tried to set the PR_ATTACH_CONTENT_ID and/or
PR_ATTACH_CONTENT_LOCATION properties to trick Outlook into thinking that it
is an imahe used by the HTML body?

I set PR_ATTACH_CONTENT_ID, PR_ATTACH_CONTENT_LOCATION and
PR_ATTACHMENT_HIDDEN - on the sent mail this properties are present,
but on the destination machine after receiving the mail all this
properties are missing, so it looks like some Outlook installations
are deleting them when receiving the mail...


--

So long...
...Bomi

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