Here are a few points which you can consider while doing computer migration. These points are applicable to all migrations irrespective of the migration tool (ADMT, NetIQ, Quest etc).
Here is a high level flow chart that describes the computer migration process:
Admin$ Access (PreMig1 Script) – Ensure that you can access Admin$ or C$ on the workstation using your migration service account. You can use the following script to test the Admin$ permission:
Ping (part of PreMig1 Script)– Make sure you can ping the workstation from the migration console/server. But keep in mind that, if ICMP is disabled on your network, you won’t be able to ping the workstation. Also, I have seen in many cases that Ping is resolving to an incorrect IP address, which can be due to a bad WINS server or bad name resolution.
Read more at - http://www.sivarajan.com/cm.html
Other Related Blogs
Active Directory Migration Using ADMT - http://www.sivarajan.com/admt.html
Computer Migration - Things to Consider - http://www.sivarajan.com/cm.html
ADMT Include File - http://portal.sivarajan.com/2011/06/admt-include-file.html
User Migration and Input File Format - http://portal.sivarajan.com/2010/12/user-migration-and-input-file-format.html
User Account Migration and Merging – ADMT - http://portal.sivarajan.com/2011/05/user-account-migration-and-merging-part.html
User Account Migration and Merging – Quest Migration Manager - http://portal.sivarajan.com/2011/07/user-account-migration-and-merging-part.html