I know these links are not the same as your problem, but is good reading material
Altiris™ IT Management Suite from Symantec™ Migration Guide version 7.0 to 7.1
http://www.symantec.com/business/support/index?page=content&id=DOC3550
Redirecting managed computers to Notification Server 7.1
http://www.symantec.com/business/support/index?page=content&id=HOWTO54441
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to move the agent from a old server (altiris 6.5) to the new server (Notification Server 7.1)
in the agent config pages in the Altiris Console 6.5, you can point to the new server and it will move agents across to the new server
or
you can run this command on the pc
aexagentutil /server:newserver.dk
You must activate the taks to upgrade Plugin Solution for agent in both case in the 7,1 console