v9.0.4454 was the first build to officially support W2K3
However,. v9.1 is a free upgrade,. and the latest build is about a year and a half newer
v9.1.4691.1 here
http://seer.support.veritas.com/docs/264658.htm
SP4a here
http://seer.support.veritas.com/docs/280008.htm
Latest Driver Pack here
http://seer.support.veritas.com/docs/273853.htm