i had sent a query to Qorax regarding the 6-12 letters which have been sent to many applicants from M1 rules. as per him these cases may have been sent to ECU... i have chcked Indian applicant threads too and some their caips reports are showing cases sent to ECU...below are some details and links for info on ECU...if anyone on this thread has requested for caips than plz share as soon as u get it.
Economic Class Unit.
"The Economic Class Unit (ECU) processes skilled workers and business category applications. Since the introduction of IRPA in January 2002, the number of economic class applications in the skilled worker category has been around 2600 per year. The Unit has been working hard to re-assess the cases files & reduce the large inventory of pre-IRPA cases". Usually some files r sent to the ECU randomly. They also assess 'Economic Fugitive' scenarios.
http://www.canadavisa.com/canada-immigration-discussion-board/thread-1111-and-0111-who-have-submitted-docs-in-delhi-chc-only-2010-t50385.5010.html
http://www.canadavisa.com/canada-immigration-discussion-board/qorax-seniors-pls-help-on-prejune-caips-bfd-ecu-t101808.0.html
http://www.canadavisa.com/canada-immigration-discussion-board/qorax-indexed-t74858.315.html