AD Upgrades.

We've recently updated a 1000 user Active Directory domain for a client, this time including the removal of 2 Enterprise Certificate Authority and Sub-ordinate Enterprise Issuing CA's, then restoration of both CA’s onto new 2008 member servers.

Now the Domain Controllers have all been replaced with new 2008 DCs as well as PKI infrastructure being placed on a newer, supported platform - all  with no disruption.