Is er-6 mandatory for all assessee?

Dear All,

As notification showing in www.aces.gov.in at download section :

E-filing of Central Excise Returns (ER1,ER-2,ER-3,ER-4,ER-5,ER-6, ER-7 & ER-8) made mandatory for All Assessees wef 01.10.2011 vide Notification No. 21/2011 and No. 22/2011 - Central Excise, both dated 14.09.2011 .

Please let me know ER-6 is mandatory for All assessee or applicable for who pay the Cenvat duty above or equal to 1 Crore.