I have this problem. When i open my Windows mail, the first folder to go in is INBOX. Whenever i click other folder (for example, Outbox or Sent) and come back to inbox, i find that the latest e-mail i receive will be deleted. The inbox mail will keep on delete if i repeatedly go to other folder. I belive it should be because of virus/worms. I downloaded avast and latest update, and get all of my drive scanned. But the problem still there after the scan. What could be the problem?