I want to Change the OS of existing SEPM, What will be the step
If you are not move your SEPM server to another server you can follow Disaster Recover process
Symantec Endpoint Protection 12.1: Best Practices for Disaster Recovery with the Symantec Endpoint Protection Manager
If you want to move new server Check this article :
Symantec Endpoint Protection 11.x: Best Practices for Disaster Recovery with the Symantec Endpoint Protection Manager
Thanks In Advance
SEPM Knowledgebase Documents
then move SEPM to another machine
Help Link: http://www.symantec.com/business/support/overview.jsp?pid=54619
What version are you running?
SEP Firewall "Did You Know...?" - How To Monitor Web Traffic
SEPM 12.1 RU2
Can we install SEPM on Windows Server 2008 Standard Edition ?
Yes you can install it on 2008..
Please don't forget to mark your thread solved with whatever answer helped you : ) Rafeeq
yes you can install check system requirement
System Requirements for Symantec Endpoint Protection, Enterprise and Small Business Editions, and Network Access Control 12.1.2
System requirements if you are installing version below 12.1 RU2: