hi ;
according to the 2012 nac gartner report juniper in the left corner , last year and 2010 juniper was on the top of the right corner .
Why juniper is losing values ?
Juniper is *NOT* losing its value.
Gartner is just one of the analysts, here is the report from Ogren group that cites Juniper as a leader.
http://www.marketwatch.com/story/ogren-group-sees-strong-resurgence-in-nac-market-2013-03-25
Regards,
Raveen