As mentioned in the DOC5670 that VM are not recomended for production due to Latency can be caused from things like insufficient memory, slow disk subsystem configurations, use or excessive
use of snapshots, insufficient CPUs, and many factors that can affect the ability of the VMs to get the resources when they are needed.
If its your test you can go ahead but with Production it may be at risk, so you have to be careful before implementation.
Please Refer the Articles below for Reference.
Symantec Management Platform and Altiris Solutions Support Matrix
http://www.symantec.com/docs/HOWTO9965
IT Management Suite (ITMS) 7.5 Documentation
Article URL http://www.symantec.com/docs/DOC5131