Report directly to excel without html preview.
One answer
RRDI might be a better solution for this particular use case. You could use Cognos capability to schedule and deliver an excel report directly to your boss.
Some more info you may find helpful:
https://jazz.net/forum/questions/67909/what-are-the-recommendations-for-birt-v-rrdi-reports
http://pic.dhe.ibm.com/infocenter/cbi/v10r1m0/index.jsp?topic=%2Fcom.ibm.swg.im.cognos.ug_cc.10.1.0.doc%2Fug_cc_id9770CreateSchedules.html
http://pic.dhe.ibm.com/infocenter/cbi/v10r1m0/index.jsp?topic=%2Fcom.ibm.swg.im.cognos.ug_cc.10.1.0.doc%2Fug_cc_id6099EmailaReport.html
Some more info you may find helpful:
https://jazz.net/forum/questions/67909/what-are-the-recommendations-for-birt-v-rrdi-reports
http://pic.dhe.ibm.com/infocenter/cbi/v10r1m0/index.jsp?topic=%2Fcom.ibm.swg.im.cognos.ug_cc.10.1.0.doc%2Fug_cc_id9770CreateSchedules.html
http://pic.dhe.ibm.com/infocenter/cbi/v10r1m0/index.jsp?topic=%2Fcom.ibm.swg.im.cognos.ug_cc.10.1.0.doc%2Fug_cc_id6099EmailaReport.html