IMAPS Sent Mail Attachments

I use two computers, one with Outlook XP the other with Vista Windows Mail,
on an IMAPS account. Windows Mail does not show a column for attachments in
the Sent Items folder. When selecting View/Columns..., there is no checkbox
for Sent Items attachments. Attachments sent from the Outlook computer do
not appear on the Windows Mail computer. How do I configure Windows Mail to
show these attachments. Note that all other IMAPS folders show attachments -
this is unique to the Sent Items folder.