Last week our ISP forced us to change our public IP Addresses. Everything "seems" to be working fine, except for the fact that we are not certain emails and our internet does not work internally now unless I add the DNS of the ISP to each pc/laptop. We use Active Directory with an internal Exchange 2010 server. THe network settings for each pc were pointed to (2) internal DNS servers (do not have a public IP Address associated). Before the change our internet worked great and we were receiving all emails, but not now. The ISP claims they have no issue with what is going on, but aside from the public IP change, nothing else has changed. Please help???