If you want to create a large amount of test user accounts in your domain, you can use the following command to quickly add all the user accounts! This will save you a lot of time…. 
FOR /L %i in (1,1,100) DO dsadd user “cn=User%i,ou=Gebruikers,dc=exchange,dc=local” -samid User%i -upn User%i@Exchange.local -fn User%i -display User%i -pwd P@sswOrd -disabled no
Exchange MVP Jaap Wesselius has published a free Exchange 2010 eBook. You can download the eBook from the Red Gate Software site.
Chapter 1: Introduction to Exchange Server 2010
1.1 Getting Started
1.2 What’s been removed from Exchange Server 2010?
1.3 What’s new in Exchange Server 2010?
1.4 Exchange Server 2010 and Active Directory
1.5 Exchange Server coexistence
1.6 Exchange Server 2010 Server roles
1.7 Summary
Chapter 2: Installing Exchange Server 2010
Chapter 3: Exchange Server 2010 Coexistence
3.1 Coexistence with Exchange Server 2003
3.2 Installing Exchange Server 2010 in an Exchange Server 2003 environment
3.3 Coexistence with Exchange Server 2007
3.4 Installing Exchange Server 2010 into an Existing Exchange Server 2007 Environment
3.5 Summary
Chapter 4: Managing Exchange Server 2010
4.1 The Exchange Management Shell
4.2 The Exchange Management Console
4.3 The Exchange Control Panel (ECP)
4.4 Role Based Access Control (RBAC)
4.5 Archiving and Compliancy
4.6 Summary
Chapter 5: High Availability in Exchange Server 2010
5.1 High Availability in Exchange Server 2010
5.2 Exchange Server Database technologies
5.3 High Availability in Exchange Server
5.4 High Availability on other Server Roles
5.5 Summary
