After recently switching to a new computer, we have noticed an issue with our windows live mail 2012. Some emails are received on one computer but not the other, and vice versa. I have gone through all the server settings and passwords with our email host and we are certain that the issue lies within the live mail program itself. 

For example, we will receive an email from "*** Email address is removed for privacy ***" on pc "a" but not pc "b", we reply and joe's reply comes back on pc"b" but not pc "a". There is no consistency nor pattern to which emails each computer receives from the server.

I would greatly appreciate any help as this is our business email and it is causing us substantial problems with working with our customers.