Can you please clarify some information;

- You have a POP account. is this POP account configured on more then 1 PC?
- You stated you copied personal folder files to you new computer. Did you import this data into a different account or to the same account?

Try to be specific in the steps you took. From what information you have already provided it appears you copied everything on the POP account then imported this data back into your PP account.this will most certainly cause duplicate messages.

Keep us posted