I wonder if the linux can install the McAfee 7.0
No. 7.0 is windows-only
Do you have any installation guideline that would help me to install in linux.
Please use Amavis.org
. They all have documentation either on-site or in the package. If after reading you've got specific questions, please post them.
The server i installed will be the Macfee server in the compant which may help me to install and update the virus pattern(.Dat) in the system to the 20s PC client (Microsoft windows)
AFAIK to be able to update .DAT files you need to script this in Windows, preferably some action at login time (and no I can't help you with that: too long ago).