I have to move one email system (IpSwitch IMail) from one server (Windows 2003 32-bit Standard SP2) to a new server (Windows 2008 64-bit R2 Standard SP1) and I am trying to test this before I do it. The problem is that in order to do this in testing mode or in the real migration, I have to copy 20GB of data from the old server to the new server. I cannot get a complete copy of the email data when the email services are running and the fastest way I have found to do it (nic to nic) still takes around 90 minutes which is unacceptable for our company to be without email. I am looking for the fastest way to copy this complete data from machine to machine whether it be all at once or using a utility which can copy files while they are being used or whatever. Software, cables, hardware can all be options to make this work fast. Thank you for your help!