Is there a way in Cognos Connection to set up a subscription to send out a report only when there is a change in data? If so could you please guide me. Thanks.
Event Studio would be the tool to use for that.
http://pic.dhe.ibm.com/infocenter/cfpm/v10r1m0/index.jsp?topic=%2Fcom.ibm.swg.im.cognos.ug_cr_es.10.1.0.doc%2Fug_cr_es_id155event_studio.html
You can also set up watch rules that send out notifications when certain defined values change.
Take a look at the Cognos Connection User Guide - chapter 6. Look at the section "Watch Rules in Saved Reports"
http://public.dhe.ibm.com/software/data/cognos/documentation/docs/en/10.2.1/ug_cc.pdf
Cheers!
MF.