MSN POP Folder created by em client emails transferred from inbox

We are using this wilh an msn account. Since we installed it, it created a folder called POP as a subdolder of the delted items folder and moved all of our emails to it, 12 years worth. We went into the inbox and it was empty. Fortunatly, we dound the POP folder and moved everything back into the inbox before we empty the deleted items folder. It since recreated the POP folder and moved a portion of items in the inbox into it. How can we stop this?