The notice you received was due to the End of Engineering (EOE) support coming up. There will not be anymore bug fixes for the 6.0 branch when EOE expires. End of Life basically means that you will be giving configuration support. Here is the EOL page for all SSL VPN branches (6.0, 6.1, 6.2, 6.3, etc) http://www.juniper.net/support/eol/ive.html
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