How To Copy New Hotmail Account Folders & EMail messages Without Overwriting Existing Folders & Messages

Question:

I have successfully copied my Hotmail Account Folders named 2007_Inbox, 2007_Sent, 2008_Inbox, 2008_Sent, . ... 2014_Inbox & 2014_Sent, and the EMail messages contained in each of these folders, to my Win 7-Pro laptop computer hard drive using Windows Live Mail.

Meanwhile, since then, I created two new folders in my Hotmail Account called 20015__Inbox and 2015__Sent containing Email messages transferred in from my present active Inbox and Sent folders, respectively.

Question: Is there a way to copy only the new Hotmail 20015__Inbox and 2015__Sent folders, and EMail messages contained therein, to the same path on my computer hard drive without it overwriting the existing folders and files that were already copied? If so, how can I do this?

Thanks. Mark18.