A couple of ideas I found:
When you're logged in as yourself, and you send a message using the BCC
field, you will be able to see the BCC contents in your sent items.
Recipients will not be able to see the contents of the BCC field.
The BBC field is not showing on the other computers. On an open mail, you
can enable the field from the view menu, in the folder view, you can add it
by right clicking and selecting field chooser.
http://office.microsoft.com/en-us/re...+of+sent+items