Cox email merge to Yahoo

I have opened my Yahoo account however none of files i created to store useful emails went with the merger.  Thus I have lost all of the emails i wanted to save and still use.  for example we are building a small addition, all of the plans and correspondence were stored in a file.  This file doesn't exist in Yahoo and they (Yahoo) says they are gone.

Will cox stay open after this 365 day period we all have to get out stuff?

Can i email a complete folder of files to Yahoo and store them there?