This is weird; I go to my Inbox, read an email, then go to another
folder...say, "sent items", then when I go back to my "inbox", the email I
was reading is NOT there.

My folders are "inbox", "outbox", "sent items", "deleted items", "drafts"
and my "Norton AntiSpam Folder". The email I've read is not in ANY of
those.

What is happening? and How can I get that email back?