Thanks 747. I downloaded and played a little with Maildroid. By default it was setup to delete messages off the server. It downloaded all my yahoo inbox. I didn't want all that on my phone so I deleted them all before I knew about the settings. Once I deleted off phone, they were all gone from the server. That really sucked. Just so happens 2 days before I was playing with IMAP on my home computer and outlook and I think I have all my emails on my computer. Now I have to get them back into the inbox.
Anyhow Maildroid does have options to leave on server but they are global setting. I wanted to do them one by one. Dev is great at responding to emails.