Please don't open these attachments and for heaven's sake don't reply to them. These are all  phishing emails aimed to get into your server and gather  passwords, etc. They are stealing actual people's emails and signature lines to do so. 

Word of caution, don't ever open anything that you were not expecting without checking with the email source. One person in our company was not cautious enough and got a host of virus and we almost got hacked. If it weren't for a quick security scan by our IT we would have had issues greater than her computer being crashed.