Mail can't be read, duplicate messages

All the mail in my inbox disappeared from my pop-3 account. I followed instructions and deleted the envelope file and got some messages back--those that we're older than 2 years, but none of my recent files. I then rebuilt the inbox and got all my messages but when I try to open them I get the message, "The message from xxxxxxxxxx concerning “Re: YYYYYYYYYY” has not been downloaded from the server. You need to take this account online in order to download it." I have no mail on the server. If I go into spotlight and search for that message it does show up and I can read it. I found where the message was located and tried to put it into the same folder as the ones I could read. I copied all the messages in my inbox and put them into a folder, tried the envelope and rebuild routine but got triplicate messages that still couldn't be read.

I know I have completely messed up mail, but I still have my messages, just no access to them. What do I do now?