Option #1: Use Windows 7 Upgrade Advisor to check if the hardware on your existing computers is adequate;

Option #2: Use Microsoft Application Compatibility Toolkit 5.5 to check if your applications can run on Windows 7 and how to resolve compatibility issues

Option #3: Run your XP dependent applications in XP mode on Windows 7.

To find more detail on the application compatibility issues, check out this blog post.

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