The only operating systems that Microsoft currently accepts as part of their WHQL (Windows Hardware Quality Labs) certification process are:

Windows 2000
Windows ME
Windows XP

Since the RADEON 9700 and RADEON 9000 series of cards from ATI were released after the July 1st date, there was no way to obtain certification for these drivers. Microsoft certification of drivers is the most significant 3rd party qualification of a devices stability and quality. ATI's CATALYST drivers are based on the foundation of stability and quality and as such every driver that ATI makes available must go through Microsoft certification.

Although Microsoft no longer certifies devices under those operating systems, ATI still supports them. Users of Windows 98 and Windows 98 (SE) just simply need to use the WHQL certified Windows ME driver provided both on our shipping CD's and on our website. ATI also has an NT4 driver available for the RADEON 9000 and RADEON 9000 Pro which will be made available shortly.

Furthermore users of those operating systems are still supported by ATI's customer care program and can still obtain technical support.

Hope this clarifies the situation, and alleviates concerns.