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I am using Vaadin 7.4.3 version currently, would you recomend to use vaadin 7.6.6 version? is it a final version or beta version?
Absolutely we recommend. Latest release 7.6.6 / Read release notes (Version 7.6.6 built on 2016-05-11.)You may check https://vaadin.com/download/release/7.6/7.6.6/release-notes.html