I've installed symantec client 9 onto my servers with Windows 2003 installed and then placed the corresponding GRC.dat at D:\Documents and Settings\All Users\Application Data\Symantec\Symantec AntiVirus Corporate Edition\7.5. Then, reboot the server.
I found that the virus pattern is up-to-date. However, the scan engine is a very very old version 1.x.x.x. On other machines with the same client version installed, I checked that the scan engine being used is 188.8.131.52.
Please advise the possible causes. Thanks a lot.