Due to an acquisition of several smaller organizations we now have to migrate users and their machines (Windows 2000 & XP Pro) from their old domains (NT & 2000) to a 2003 domain. What are best practices? How best to ensure that locally installed apps do not break?
Are there good tools (free and non-free) available to help? We're looking at about 2500 users and machines.
Here's a twist: all users have had their email (Exchange 2003) set up on their current setup so they have user accounts on the new domain.