The most important part of any migration to SBS 2011 Essentials involves properly preparing your existing SBS server. The time and thought you spend on a full and careful preparation of your existing SBS server has a direct impact on the success of your migration. Don’t just start a migration without first preparing. Read this entire appendix carefully, and read Microsoft’s migration guide as well. Be sure you understand what will happen and what the requirements are before you start.
The steps for preparing your server are as follows:
Do a full and complete backup of the existing SBS server.
Install all current service packs and other updates on the server.
Configure your network for the migration.
Configure Active Directory. ...