When I go to my Google Email on a desktop, I read and delete my email. Then I notice that on my N800 in "View e-mail inbox" I see really old email which I also delete. Now even though I do not get any new email at all, my N800 keeps showing more old email. How can I prevent this from happening?

Futher investigation determined that when I select "View e-mail inbox" I need to select "edit", "select all", select "edit" again and select "Mark as read". Now I can finally select the trash can below to delete these old emails.