1.3. Designing User State Migration
The majority of Microsoft installed clients are Windows XP. Thus, if you're considering adding Windows 7, you probably have many Windows XP clients. Unfortunately, there isn't a direct upgrade path from Windows XP to Windows 7.
If you can do a direct upgrade, you won't need to worry about migration. An upgrade will retain all of the installed applications and all of the user's data. An upgrade is still considered a risky operation, and it's possible that things can go wrong, so you should always have a backup of the user's data in case the worst happens.
If you've looked at the upgrade paths from earlier versions of Windows to Windows 7, you may have been a little surprised. There are very few upgrade ...