Hello,
After installing SP2 it is necessary to reinstall only the remote agent.It is not required to reinstall exchange or SQL agent.
You can refer the following technotes as an additional information.
Release Notes for Backup Exec 9.1 for Windows Servers revision 4691 - Service Pack 2
http://seer.support.veritas.com/docs/275399.htm
VERITAS Backup Exec (tm) 9.1 for Windows Servers revision 4691 - Service Pack 2http://seer.support.veritas.com/docs/275247.htm
We hope this will help you.
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deepali