I just received 650 old EMails when I clicked on "send receive all". They went right back to early last year and were all messages that I had read and deleted, or so I thought. Any thoughts on why this has happened?

Sounds like those old emails were stored on the server, take a look at this page.

I have Office Outlook 2007 but I was able to find and uncheck the "store copy on server" button. Hope this stops the problem. Thanks again.