Exchange 2007 - what a product :-) I was guilty of underselling it at the Bristol SBS Partner Group. I said some of the features people wanted were only in the Enterprise Edition, but I was wrong, they are in the Standard Edition, but require the Enterprise License (which is a top up on the standard License). Obviously SBS 2003 can work with Exchange 2007, but only on a seperate server as SBS 2003 is 32-bit only and production Exchange 2007 is 64-bit only. The enterprise CAL is only a few dollars on top of the Standard CAL, so if you want the features, definately something to look for. So, what is the difference between the two version? http://www.microsoft.com/exchange/evaluation/editions.mspx Exchange Server 2007 Edition Offerings Feature Standard Edition Enterprise Edition Storage Group Support 5 storage groups 50 storage groups Database Support 5 databases 50 databases Database Storage Limit No software storage limit; storage limit is hardware dependent No software storage limit; storage limit is hardware...