Seems that in Preferences/Advanced and selecting (checking off) the choice of leaving copies of mail on the server isn't working in Mail...I turned it off so that all my mail downoads without a copy on the server...
I checked my mail at work today using my ISP's webmail on their site and all the mail I downloaded (100 messages) was still up there from this weekend.
I have a very simple, straightforard email account at home, nothing fancy (POP and SMTP) and with that Mail feature of removing messages from server not working...any thoughts? Is their a site where it runs through Mail's features and trouble shooting?