Very strange, here's some iPhone (2.1) screen caps of what's going on.
On refresh emails disappear and I'm not sure why.
On the left is my inbox on 11/03/08, on the right is 11/04/08.
I did not delete anything from the inbox, in fact on my testing laptops (outlook w/ connector) and webmail there's plenty in the inbox.
Has anyone else had this happen?