If you are planning a migration from SBS2003 or SBS2008 to SBS2011, you need to run through this checklist. For detailed descriptions, see the full blog post here – http://blogs.technet.com/b/sbs/archive/2011/07/01/sbs-2011-standard-migrations-keys-to-success.aspx
- Read through the migration guide before starting.
- Watch the migration video demos and online training.
- Join the Small Business Server forum.
- Practice a migration yourself in a test environment.
- On the Source server, run the SBS 2003 Best Practices Analyzer or SBS 2008 Best Practices Analyzer.
- On the Source server, make sure the Active Directory is healthy.
- On the Source server, check the Primary group of the account you will use to install the SBS 2011 server into the domain.
- Make sure the Admin account you are using for the migration has a STRONG password.
- SBS 2003 must be on a class C subnet (subnet mask of 255.255.255.0).
- Install the samsrv.dll update from KB 939820 on all Windows 2003 domain controllers in your environment, including the SBS 2003.
- In the source domain, check for the existence of an account named Postmaster.
- Check Exchange Server 2003 policies and remove the following ones, if they exist:
•Existing Mailbox Management policies
•Duplicate SMTP addresses in recipient policies
•Invalid SMTP addresses in recipient policies - Disable WSUS on Source domain prior to migration.
- In the source domain, disable anything that may install software on machines added to the domain.
- On the Source server, verify that the SBS organizational units are present.
- On the Source server, run the SBS 2011 Migration Preparation Tool
- Make a System State Backup of the source server.
- Do not make any changes on the network.