Dear Michael,
I just attested for MU stage 1, year 3 for 2013 .
You do have to submit 1 years worth of data for years 2 and 3.
I used version 6.3.3 , 2011 edition and there was no problem with attestation. Amazing charts verified that this was the correct edition to use.
I think that what the webinar may have alluded to was that to do stage 2, you need only 3 months of data for 2014 and that AC needs to be certified for stage 2 which it is currently not to my knowledge.
but AC has said that they will be by Oct.
hope this is helpful
bala
