After creating handwriting mail by Outlook 2003 (word 2003 is selected as mail editor) I have sent to my self mail account and received in four clients. O and OE in the same Tablet PC I sent handwriting, another O and OE installed in the different PC. I intended O: as Outlook 2003, OE: as Outlokk Express 6. Every OE is unchecked "Read all messages in plain text" and "Do not allow attachments to be saved or opened that could potentially be a virus" Also I have set my mail account could be received by these four clients for my experiment.
The result:
Both O sucessfully received handwriting content as expected but both OE does not, only <Handwriting content> did show.
However when I forward (again to myself) what I received by O in another PC, I found both OE could successfully receive the handwriting. This is NOT true when I forward what I received by O in tablet PC, both OE showed just <Handwriting content> forwarded.
I checked the two forwarded mails' source by OE File>Properties>Details>Message Sources and I found there are quite huge difference in the mail format.
Is this result consistent with your design?

I finally noticed that the behavior of OL2003 installed in TabletPC and XP PC is different.
When I sent an ordinary mail having one picture inserted from OL to OE, the picture sent from TabletPC didn't show
up while one from XP PC did show perfectly by OE.
I will continue to check this might be an issue of OL specific I installed in my TabletPC.
Anyway this was not specific to the handwriting mail.

Thanks,
Mikio