The only thing I can see is that AFTER installing the SPs for Broker on 6.01, the following files are in the Broker Server Root Install Directory:
Broker_ProgramFiles_6-0-1_SP1_README.txt
Broker_ProgramFiles_6-0-1_SP2_README.txt
This is the only indication that the SPs have been applied as there is no UPDATE directory with JARS.
HTH,
Ray
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