I have EASE 3.0 and would like to upgrade from Windows 98 to XP. Will I have a license problem or can I just upgrade without any problems?

Although the OS upgrade process should not affect the licencing system we have made the contrary experience. Please export your licences to a different computer before you upgrade. Alternatively you can also terminate the licence and send the termination key to ADA. After the upgrade you can request a new key for your system.

Have you considered upgrading to 4.0? Licencing has been simplified dramatically. In your case, for instance, you would just connect to the internet, upload your licence, upgrade to XP and download the licence again.